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Underbody braces, turbos and more!

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PostPosted: Wed May 30, 2012 7:17 am 
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Joined: Tue Feb 17, 2004 5:39 am
Posts: 205
Location: Melbourne
this engine just had a chance to see it with manifolds off and the exhaust ports are tiny!!! smaller than G10A by far.

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PostPosted: Wed May 30, 2012 2:34 pm 
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Joined: Fri Apr 27, 2012 6:51 pm
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Location: new zealand
Was that the na or turbo version?


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PostPosted: Sat Jun 02, 2012 10:34 am 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Greetings Earthling - wow........ someone as nuts as me - Ive just stumbled across your post re 3 metre "tinny" with a jet ski drive......... .

This is EXACTLY what I am doing right now in Brisbane Australia and if you like, I would be delighted to share with you any good ideas or thoughts on the matter.
Firstly let me say that I`m probably going overboard - but hey No1# because you only live once and No2# because I can!
The idea of a "tinny" with a "quick" 4 cylinder from a Suzuki GTI has plagued me for a 20 years or more so now I`m retired - I`m into it.
As we speak we are well on the road, here`s where we are at.........

Hull - Savage "Snipe" 3.8 mtr x 1.58mtr / Completely replaced hull bottom with 4mm sheet, smooth finish (no "ribs") / 900mm x 150mm hull planing strake at rear at custom high flow mandril bent water intake / tuck replaced with 5mm flat plate / full length 5mm thick x 40mm wide chine rails / stern and middle thwart bench seats removed / full length 2mm box section beams ,410mm apart, stem to stern and additional horizontal ribs fitted / 2mm false floor full length (under floor foam filled) / 1.6mm raised "decking" and engine compartment and driver - passenger area forward of engine / 2 x high back rally bucket seats (driver and passenger) / forward controls steering etc etc -/ Forward thwart seat retained for extra passengers or when going fishing (fair dinkum!)

Fitted with 20mm x 25mm electric - hydraulic stainless steel trim tabs with steering wheel "paddle" controls.
Underfloor 60ltr fuel tank with "Carter" lift pump into swirl tank and "Bosch 044" high pressure fuel pump.

Motor - G13B Suzuki 16 valve twin cam 1300cc - ex Suzuki Swift GTI
Drive - Seadoo 215 GTX. 10 vane pump - drive unit with reverse flap
Impeller - sst 15.5 x 22.5 variable high performance
Drive is taken from a modified splined crankshaft pully at "front" of motor as ALL jet skis drive the impeller ANTI CLOCKWISE!

Engine Mods - Cylinders bored 10 thou over and head end of cylinders "plated" into block / block and head "O" ringed / sollid copper head gasket / head mildly ported, uprated valves springs /modified billet camshafts and variable adjust cam wheels / std cam followers /uprated valves and modified seats / uprated high flow fuel injectors / custom high flow fuel rail / "upstream air intake" 5th fuel injector /ARB head studs / ARB main bearing bolts / completely dry sumped / 3 stage dry sump pump and 5 ltr tank / 15 row 250mm x 150mm fan cooled oil cooler / "Savage" coolant water heat exchanger / crankshaft sensor fired MSD ignition system (one coil per cylinder - no distributor) /"MicroTech" ECU / billet 2kg flywheel / H pattern forged con rods / 7.8 to 1 compression forged pistons with high performance rings / custom tuned length stainless steel extractors / custom billet anodised sea water water cooled intake manifold / "Sprintex S5-210" supercharger @ 25psi max boost / 60mm throttle body / "NOS" multi point gas injection with steering wheel operation bottons (1 x purge and 1 x operate / fully balanced and crack detected everything........

Expecting 400hp- 450hp (easy!) at 7000 - 8000 rpm (engine dyno will confirm)

Motor is in bits as we speak and at trial assembly stage, once final assembled , it will be "bench run" and engine dyno tuned, fitted to hull then final tuned in the shakedown run.

When the wife finds out what i`ve been up to over the last few months over at the shed she`s gunna go ballistic - just hope she NEVER finds out what its all cost..................

Wen done I`ll post photos and performance figures.........and probably the "Decree Nisi" following my divorce ............but hey...its worth it!!!!!!!!

Cheers- Keiron


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PostPosted: Sat Jun 02, 2012 6:15 pm 
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Joined: Fri Apr 27, 2012 6:51 pm
Posts: 20
Location: new zealand
Hi keiron

wow that sounds like a pretty impressive engine setup you've got there! i'll be extremely happy if i can get a reliable 140hp. I've got the kawasaki zxi 1100 jet unit i'm using sitting here and it definately needs to spin clockwise (looking from the bow) so should mate up to the flywheel of anything but an older honda.. crank pulleys spin clockwise right??? :shock:


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PostPosted: Sat Jun 02, 2012 10:35 pm 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Gidday again - last time I looked cranks spin clockwise.........
I bought my jet ski bits from Jetsport Qld (jet ski wreckers) Ph 07 5531 3855 email www.jetskiparts.com.au and they told me (and mine does) that impellers run anti clockwise so figure that one out........
The guy doing my engine build and mods is a bloke Darren Robb at Billet Inc Brisbane (www.billetinc.com.au) ph 07 3829 2210 - he has a 750cc Suzuki motor cycle engine fitted with a Sprintex supercharger and heaps of go gear that makes 750hp in his hill climb car I`ve seen it with my own eyes and its ballistic!!!!!!!
He can and does make ANYTHING from billet blocks and has a history in race built engines to die for.
His mantra is 100hp per cubic inch..............
One thing - you wont need a flywheel - a flex plate or super light flywheel will do the trick as your not pulling a dead mass such as a car and need momentum etc and you will need all the torque and revs you can get quickly to get you "out of the hole" and onto the plane.
You want to give serious thought to beefing up the bottom of your tinny as usually they are made of 1.6mm ally and at a serious speed (anything above say 40-50kph it will become like tissue paper and if you hit a twig or a floating coke can or something not much you will be in deep dark (wet) doggy do........
Oil cooling as well as engine cooling is an issue unless yours is air cooled and even then you will have to be smart cos the air flow isn`t there like it is on a bike and if your water cooled you dont want to use sea water in an ally motor eh. A closed loop system will be essential - somthing like a heat exchanger.
Hiding down there in the bottom of the boat the sump will reach temps that will fry eggs easily so red hot oil burns and cooks motors its so thin so think that one through.
I`m saying this cos remember you cant just get out and walk home eh.
I know I`ve gone overboard but hey, thats what happens -you start with a simple rational idea then it becomes I`ll have to do this for this reason and while I`m there if I do this that would make it go better eh and while I`m about it I might as well do that and so on and so forth till you wind up like me and have gone nuts and broke but hey - its worth it!
I`m busting my guts to get this in the water as we reckon that 120 to 140 kph maybe more - is a definite pos and that if FLYING on water..........
My pet dream is to find some dude on a really top of the line jet ski and line him up in my tinny and blow him into the weeds HAH!!!!!!
(some blokes just never grow up!)!
Give those blokes a ring - it wont cost a bomb to ring OZ from your place and have a yarn - especially with Darren Robb - tell him I recommended him to you - no problems.
Keep me in the loop and I will you also - when I`ve got some photos I`ll post them FYI.
Cheers Keiron


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PostPosted: Sat Jun 02, 2012 11:07 pm 
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Joined: Fri Apr 27, 2012 6:51 pm
Posts: 20
Location: new zealand
I'm actually building a hull from scratch, will be 6 or 8mm along the bottom. im building one the same as this:

http://www.nzjetboating.com/yabbse/inde ... ic=22018.0

I'll be running a heat exchanger as well as a water/air intercooler. Will keep an eye on oil temps and add an oil cooler if necessary. I'll post a link to a build thread once i get one started, would be great to see some pics of yours!

Have just found some info regarding tuning of the k6a out of cappucinos to some pretty silly hp, 300 plus.. so hopefully my 1L version has at least a little bit of potential!


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PostPosted: Sat Jun 02, 2012 11:45 pm 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Just checked out the site you offered - I retract the statement - you cant get out and walk home............. you kiwis are nuts they are creeks and streams - only inches deep - prang it or hole it and you CAN get out and walk home - STRUTH!!!!!!!
great little hull though -I see that your mindful of a bullit proof bottom - you`d HAVE to be considering where and what your doing with it.
Those rocks (boulders ) and half a tree etc in the intake would freak me out - no wonder the impeller doesnt last long ...even a stainless steel impeller would cop a flogging in that sort of environment - neat set up - I`m impressed - well done - do the same thing and it will be a ball tearer for sure........maybe I`m not so mad after all ....you guys are the nutters, at least our rivers and waterways are a bit bigger and DEEPER or maybe thats the REAL thrill of it eh - onwards ever onwards!!!!!!!!!!!


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PostPosted: Sat Jun 02, 2012 11:45 pm 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Just checked out the site you offered - I retract the statement - you cant get out and walk home............. you kiwis are nuts they are creeks and streams - only inches deep - prang it or hole it and you CAN get out and walk home - STRUTH!!!!!!!
great little hull though -I see that your mindful of a bullit proof bottom - you`d HAVE to be considering where and what your doing with it.
Those rocks (boulders ) and half a tree etc in the intake would freak me out - no wonder the impeller doesnt last long ...even a stainless steel impeller would cop a flogging in that sort of environment - neat set up - I`m impressed - well done - do the same thing and it will be a ball tearer for sure........maybe I`m not so mad after all ....you guys are the nutters, at least our rivers and waterways are a bit bigger and DEEPER or maybe thats the REAL thrill of it eh - onwards ever onwards!!!!!!!!!!!


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PostPosted: Sun Jun 03, 2012 2:14 am 
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Joined: Fri Apr 27, 2012 6:51 pm
Posts: 20
Location: new zealand
hahaha im not sure whats crazier really... trying to get up a trickle of water or trying to drive a 3.8m boat with 400hp!!


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PostPosted: Sun Jun 03, 2012 3:08 am 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Back again - just as an aside - to be honest I`,ve only told you half the story cos in reality I`ve got a small passion for G13B motors as I have one in a project car that I built in the 90`s and its a dead set head turner and goes like a cut snake even with the fact that it was a front cut from the wreckers and had 96k on it so I thought I`d see how it goes stock before I went nanas on it - then came along the idea of a tinny with a G13 B in it so I got another motor and the rest is history - BUT if this motor goes as expected then its out of the boat and into the toy car.............
So what goes back in the boat???????????
Ummmmmmmmmm........ my guess is the 13B ROTARY sitting in the shed looking all lonely and BEGGING for a MONSTER rebuild!!!!!!!!!!!
Billet Inc are specialists at building all alluminium rotary motors from scratch (you MUST check their site - though limited info on site at the moment it is currently being updated but you will quickly get the drift)
The plan is - go birko with the rotary - Turbo`d this time as turbos work better on rotaries than superchargers and all the usual go fast mods ie ignition systems fuel injection etc etc ....

Reality is REVS REVS REVS and NOTHING revs like a rotary - 12000RPM would be ordinary....with this motor 14000rpm would be passe.......and that would make.......wait for it ...........1000HP PLUS!!!!!!!!!!!

Now just get your face around that!!!!!!!!!!!!

A 12ft tinny with a 14000RPM plus - 1000HP direct drive 13B Rotary having NOS forced down its neck at up to 30PSI winding a 15.5 x 22.5 210mm (81/2) inch variable pitch impeller at 14000-15000RPM................

Now if that doesnt "float your boat and give you your jollies" then your not breathing!!!!!!!!!!!

This is stage 2# ..

this is provided we survive stage 1#

and its not the boat I mean .........I`m refering to the cook!!!!!!!!

No - these are not the ravings of a geriatric dreamer - I`m on a mission and Im not going to go out quietly........

The last time I did 100mph plus on water was in 1973 in a tunnel hull I used to race ........and then I got married and had kids.....
I said that I wouldn`t do that again.....
Now they`ve grown up and gone....

I guess I lied.....


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PostPosted: Sun Jun 10, 2012 8:45 pm 
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Joined: Tue Feb 17, 2004 5:39 am
Posts: 205
Location: Melbourne
nzjet wrote:
Was that the na or turbo version?

dont think the latest twin cam 3 cylinder come in turbo??

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Suzuki bring back cheap lightweight cars but this time in RWD


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PostPosted: Mon Jun 11, 2012 5:46 am 
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Joined: Fri Apr 27, 2012 6:51 pm
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Location: new zealand
K10a is actually a 4 cyl and yip they did


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PostPosted: Mon Jun 11, 2012 8:29 pm 
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Joined: Tue Feb 17, 2004 5:39 am
Posts: 205
Location: Melbourne
nzjet wrote:
K10a is actually a 4 cyl and yip they did


Right! Im mistook it for the latest Alto K10B when you get pics of the exhaust let us know it must be interesting to see what the Indian made motor and car did to the exhausts to make if more thrifty

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Suzuki bring back cheap lightweight cars but this time in RWD


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PostPosted: Tue Jun 12, 2012 1:30 am 
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Joined: Fri Apr 27, 2012 6:51 pm
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Location: new zealand
sure thing, picking it up tomorrow morning.


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PostPosted: Tue Jun 12, 2012 3:04 pm 
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Joined: Fri Jan 08, 2010 9:56 pm
Posts: 414
Location: colorado river, arizona USA
My experiance growing up and living on the colorado river tells me rpm is the key with a jet in reguatds to top speed...torque is worthless...a stock 350 can pin the tach in a jet boat(berkley pumps)...i have ambitions to do a renisis 13b-msp in a 18' riverboat eventually..itd be perfect...im guessin 70 mph easily...my bro has a 17' g3 with a 90 hp 4 stoke yamaha out board that does 60 gps verified...its plenty fast...also done 116 in a 1800 hp. 36' cougar picklefork catamaran..so ive been at both ends...200hp and 10000rpm in a smallboat would kill a 375 hp 5500rpm v8 in the same boat gaurenteed. Best of luck..post pics!


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PostPosted: Tue Jun 12, 2012 8:16 pm 
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Joined: Wed May 16, 2012 2:40 am
Posts: 7
Location: australia
Ah somebody that feels the same - need for speed - I`ve track raced modified production cars - drag raced hot sedans - ridden quick motorbikes - but NOTHING equals or beats the sensation of high speed on water and the absolute edge of the envelope sensation it brings eh!!!!!!!Watched a U tube bit on jet boats racing up the rapids in the USA - I mean these were 18 footers with MONSTER motors doing up to 100mph plus - now to be honest I think I might draw the line about there - these guys are first class nutters but hey - who am I to judge..........we all get our jollies in our own way.......Things are progressing well on the build this end and I will post happy snaps when I`ve got an interesting progressive collection untill then we`ll just plod on quietly till launch day - Thought...... never put off till tomorrow what you really want to do today cos that chance may never come again so as NIKI say - "just do it" Cheers - K


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PostPosted: Wed Jun 13, 2012 12:48 am 
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Joined: Fri Apr 27, 2012 6:51 pm
Posts: 20
Location: new zealand
Hi Rtsblwn

I do think big v8's etc do have a place in jetboats. Larger, heavier ones which might need to carry a load especially. If that boat can redline then it needs an impellor change! For small boats however weight is key so small engines are the way to go! mine should end up weighing less than a jetski with a similar sized engine. Will be interesting to see if the k10a has enough power to keep me happy or if i will need to look into supercharging etc straight away.


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PostPosted: Fri Jun 15, 2012 9:33 pm 
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Joined: Tue Feb 17, 2004 5:39 am
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Location: Melbourne
Shouldnt a light 2 stroke be better than any 4 stroke?
Otherwise why not use a cheap 4 stroke bike motor with boost?

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