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Underbody braces, turbos and more!

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PostPosted: Sun Jan 20, 2008 10:29 pm 
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Joined: Fri Jul 27, 2007 8:20 pm
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Location: Saskatchewan
ok check this out, since the time I last posted, till now, this is what ive been doing!

im quite proud of it actually, did LOTS of minor minor shape changed to the head, aswell as the 2 obvious grooves. I placed the valves in there to see what I could remove up to, but mostly I just blended the whole thing.

even the elitists will agree, smoothness in combustion chamber = win

Image
1) ports finished, sanded them 3 times going progressively finer, and DAMN thats smooth. even used some of this dremel polish compound shit in there. looks alot shinier in person
Image

2) the combustion chamber, went over it slowly with some really fine grit to remove the gunk, then when I went to shaping I went to the medium stuff, didnt wanna go course or use a stone because I needed to be suuuper careful. never nicked one valve seat yet. but all possible shape changes were done, spent just an hour on this pretty much
Image
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8)

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 Post subject:
PostPosted: Tue Jan 22, 2008 3:21 am 
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this is the finished product when I took it to the machine shop for guides/valvework and head skimming
Image

however, im doing a little more reading to see if the inbetween part is going to be a concern being a hotspot or anything in the combustion chamber, im getting 50/50 responses from it, and im considering grinding down the whole center section and making it one wide groove.... if I have to... but I cant be accurate enough like that (or atleast confident in my accuracy) at this point to do it all by hand and not cc the chambers when im done, and I am trying to avoid doing that

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PostPosted: Tue Jan 22, 2008 9:13 am 
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I was wondering about that - all the pics I've seen of Someder Singh's grooves show a single goove - and even though a couple of the diagrams show double grooves, those seem to be tear drop shaped AND pointed at the plug - not parallel to one another.


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 Post subject:
PostPosted: Tue Jan 22, 2008 12:23 pm 
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I have seen some like this however, which is mostly where I got the idea from, that one raised spot between the 2 cuts would have significantly less head material to pass its heat into, and could essentially turn into a glow plug, so ive thought about gutting the whole center groove and doing that 1 groove, itll be wide, and itll lower compression, but like I said I dont have confidence enough that I can do that part accurately, maybe I just need it back in my hands to see it again

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 Post subject:
PostPosted: Tue Jan 22, 2008 12:47 pm 
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Location: Tempe, AZ
I dont have experience with ported t3's, but when porting the exhaust in turbo rotary engines bigger means faster turbo spool. I can see the 75% intake/exhaust ratio being a good rule for N/A motors, but with a turbo more flow is almost always better. If you go too big and dont upgrade to a turbo with a bigger A/R on the exhaust side you can easily destroy turbos. My guess is that you will get much better response with what you have done. Looks good!

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 Post subject:
PostPosted: Tue Jan 22, 2008 12:54 pm 
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Tom93R1 wrote:
I dont have experience with ported t3's, but when porting the exhaust in turbo rotary engines bigger means faster turbo spool. I can see the 75% intake/exhaust ratio being a good rule for N/A motors, but with a turbo more flow is almost always better. If you go too big and dont upgrade to a turbo with a bigger A/R on the exhaust side you can easily destroy turbos. My guess is that you will get much better response with what you have done. Looks good!


I also added a 2.25" mandrel downpipe to go with it when I put it back together

im worried about the grooves a little, if I just get in there with some 800grit or something and make them a little more smooth you think I can get away without having to grind it all down and probably have to cc the chambers?

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 Post subject:
PostPosted: Sun Jan 27, 2008 12:22 pm 
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Location: Tempe, AZ
Lots of smooth radius is what will eliminate hot spots, eliminating the sharp edges may be enough to keep it from being a problem.

Otherwise you up the cc of the chamber for lower compression so you can run higher boost right? :D

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 Post subject:
PostPosted: Sun Jan 27, 2008 12:42 pm 
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essentially, 9.5 compression at 12psi sounds scary, when I blew it up (albiet a tired motor) with 8.5 and 12psi

heres some other pics, I did the grooves and have to cc the chambers yet, I will then have to get the head flattened again, fuckin dremel

Image

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 Post subject:
PostPosted: Sun Jan 27, 2008 12:47 pm 
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Joined: Mon May 27, 2002 11:47 pm
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Location: San Juan, Argentina
swift13b wrote:
I will then have to get the head flattened again, fuckin dremel


Always use an old head gasket to avoid grinding the flat surface.

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 Post subject:
PostPosted: Sun Jan 27, 2008 1:10 pm 
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Location: Saskatchewan
Caaarlo wrote:
swift13b wrote:
I will then have to get the head flattened again, fuckin dremel


Always use an old head gasket to avoid grinding the flat surface.


yeah live and learn I guess, another 40 bucks >_<

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the lolcar family


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 Post subject: tubes
PostPosted: Fri Feb 01, 2008 11:47 pm 
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Joined: Sat Dec 22, 2007 12:34 am
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Location: Lincoln Nebraska
what are the brass looking tubes good for ?


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 Post subject:
PostPosted: Sat Feb 02, 2008 1:17 am 
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abby normal
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Removed mine during a valve job, and saw no economy gains or emission problems.

Leave the passage open as the vacum signal is used for the fuel pressure regulator control signal.


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 Post subject:
PostPosted: Sat Feb 02, 2008 3:09 am 
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:shock:

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 Post subject: tubes
PostPosted: Sat Feb 02, 2008 10:08 am 
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Location: Lincoln Nebraska
So if u have an old motor that has serious carbon issues it is possible u might have a fuel pressure issue? I believe geomoparman had plugged tubes before rebuild. I was going to port my head and was worried I would not have the patience to go around them. kind of wondering if the tubes should be cut off square and open at the point of entry and if it would make any differance.


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 Post subject: Re: head porting
PostPosted: Thu May 08, 2008 9:06 pm 
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Location: Purcell,OK
Any updates?

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 Post subject: Re: head porting
PostPosted: Sat May 10, 2008 4:39 am 
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update how? its still running good and beating h22a preludes with i/h/e every gear haha. I like to think part of it is because of the porting anyways

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 Post subject: Re: head porting
PostPosted: Sat May 10, 2008 5:38 am 
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:worship:

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 Post subject: Re: head porting
PostPosted: Sat May 10, 2008 6:03 am 
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Caaarlo wrote:
:worship:

:rollin:


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 Post subject: Re: head porting
PostPosted: Tue Jun 17, 2008 11:15 am 
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Location: Brentwood, CA
I just read this whole post, and have to say this... reminds me of porting my very first motorcycle when I was 16yrs old back in 1977. I bought this ancient two-stroke performance mods book at a flea market for 50cents, that got me excited about making some changes. Armed with a dremel, a book, and enthusiasm I dug in.

* I had no clue as to what I was doing.
* People told me everything from 'don't do it' to 'you'll only make it worse'.
* One guy tried to talk me out of it, but after seeing how determined I was, gave me some tips (so I wouldn't screw it up)
* I spent hours match porting, smoothing and blending, even raised the transfer ports 1mm (3-cylinder 2 stroke Kawasaki).
* I started out with the intent of just hogging things out, making it all bigger so it would breath. After reading my book about three times, that drive was tempered a bit, and I got a little conservative.

I also added pipes, jetted the carbs, and did new rings and hone. Man was it fast afterward! I was proud as a peacock.

At the end of the day, I am not sure if my port match job and transfer port raise netted any gains, the pipes, jetting, and new hone might have made the difference I was feeling, but here's the big deal... I got an education! One I could never have purchased, could never have learned in any classroom. I also became a 'doer' meaning I was willing to get away from the television and just go try something. Those lessons have stayed with me and served me well.

Bravo kid! Keep asking questions and wondering 'what if'? The older guys who have been there and tried that have tons of good experience to share, priceless in fact, but many hands on guys (yourself) need to go try it for yourself. BTW, this is one trait that many great inventors and pioneers have.

The next step is to look at your results, with a brutaly honest eye, and evaluate your end result. Fully understand what you've done. Even if your engine went backward in terms of performance, you personally have made a huge leap forward. my 2cents worth


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 Post subject: Re: head porting
PostPosted: Tue Jun 17, 2008 4:39 pm 
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Joined: Fri Jul 27, 2007 8:20 pm
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the head is coming off again soon and im going to grind down those raised portions in the combustion chamber, lower compression and hindering any predet that may arrise with 15+ psi. Id like to come down to about 9:1 rather than ~9.3:1

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1996 Metro Build QR25de swap, still undecided where to take it
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 Post subject: Re: head porting
PostPosted: Wed Jun 18, 2008 4:29 pm 
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Can't you use a few layers fo masking tape to protect the head surface also?

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 Post subject: Re: head porting
PostPosted: Fri Jun 20, 2008 3:27 pm 
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Location: Saskatchewan
Metropwr wrote:
Can't you use a few layers fo masking tape to protect the head surface also?

perhaps, not sure if itll actually help though with grinding stones at high rpms. I hope I dont have to resurface the head again when I pull it. im putting ss valves in too so ill get em to check it after I do the grinding. I shouldnt have left the raised sections

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 Post subject: Re: head porting
PostPosted: Sun Aug 03, 2008 2:32 pm 
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Location: NorCal, Eastbay.
Nice job, But its just a 8 Valve motor..... Your going to see maybe 2 hp gain from 4k-6k Maybe another 1.5 hp with 93 octane gas.

With a DOHC 16 Valve, 5 hp and 1.5-2hp with 93 octane. Unless your Turbo just double everything.

:alien:

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 Post subject: Re: head porting
PostPosted: Sun Aug 03, 2008 6:42 pm 
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Location: Saskatchewan
BoostedGTI wrote:
Nice job, But its just a 8 Valve motor..... Your going to see maybe 2 hp gain from 4k-6k Maybe another 1.5 hp with 93 octane gas.

With a DOHC 16 Valve, 5 hp and 1.5-2hp with 93 octane. Unless your Turbo just double everything.

:alien:

6 valves actually, and I seem to have noticed a jump in top end atleast. especially with the bigger exhaust manifold/turbo/exhaust

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 Post subject: Re: head porting
PostPosted: Wed Aug 06, 2008 5:26 am 
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Location: NorCal, Eastbay.
Yeah 6 valve, i must of been high..lol Whats the motor make stock 55hp? Bigger Manifold wont add much of any HP, Since the Boost adds the HP, Depending on how many lbs.

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