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Underbody braces, turbos and more!

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PostPosted: Wed Feb 07, 2007 6:27 pm 
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Joined: Sat Dec 16, 2006 2:49 am
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Location: California
I cant go over 1.5L due to racing regs, but increasing stroke and bore on a 1.3 seems a expensive and poor choice.

Cant I destroke a 1.6L by getting the rod journals offset ground?

- Gary


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PostPosted: Thu Feb 08, 2007 12:35 am 
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Location: Christchurch NZ, quake capital
Can you fill out your location please then people in your country might be able to give you more specific information...

You'd have to reweld onto the crank to change the stroke by that much and the cranks aren't the strongest so rewelding the crank for racing isn't a good option.

Try finding a g15, they have a shorter stroke but the same size pistons as the g16, I've thought about offset grinding a g15 crank by 3mm and using hayabusa rods (no welding on crank required) and boring out 1.5mm to make the engine closer to being square and also to fit inside a 1500cc class, of course custom pistons will be needed and it's a lot of hassle but it should rev a bit better... a stock g15 is 75mm(b)x84.5mm(s) I was thinking maybe 76.5x81.5 = 1499cc, just an idea :razz:


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PostPosted: Fri Feb 09, 2007 3:04 pm 
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Joined: Sat Dec 16, 2006 2:49 am
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Location: California
Sorry, California US., I fixed my profile now.

1.5L are no where to be found in US, thats why I was thinking of destroking the 1.6L which are quite common. I see your point on the weld and grind part not being stout enought to race on.

Hate to ask another naive question; I know the 1.3 crank in the 1.6 will drop the compression too much, but whats the resulting CC out of curiousity?

Thanks, Gary


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PostPosted: Fri Feb 09, 2007 3:17 pm 
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Bozo the crying clown

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if you went with +1mm oversize pistons in a 75mm bore engine (the 1.6), you could still only get 1369cc with the 75.5mm stroke crank of the G13B. using a G13A crank (77mm throw) with 76mm pistons would still only net 1397cc

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PostPosted: Fri Feb 09, 2007 6:38 pm 
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I know of a couple here, probably about US$350-400 for a G15a, don't what the shipping costs would be from NZ though :lol:


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PostPosted: Fri Feb 09, 2007 9:05 pm 
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Location: Winnipeg
What about using the 74 mm bore of the G13, with a Honda D15 crank ...mains cut down to fit in the Suzuki block of course...and there is your 1.5 with a forged crank!


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PostPosted: Sat Feb 10, 2007 3:47 am 
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Mr.Pipe wrote:
What about using the 74 mm bore of the G13, with a Honda D15 crank ...mains cut down to fit in the Suzuki block of course...and there is your 1.5 with a forged crank!


In a g13b block??? you are going to need pistons with very very short skirts, maybe gsxr 750 pistons, if you want to get 84.5mm of stroke out of a block that was designed for 75.5mm's.


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PostPosted: Sat Feb 10, 2007 4:22 pm 
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sportage4x4 wrote:
if you went with +1mm oversize pistons in a 75mm bore engine (the 1.6), you could still only get 1369cc with the 75.5mm stroke crank of the G13B. using a G13A crank (77mm throw) with 76mm pistons would still only net 1397cc


The 1.6 blocks are 25mm taller, so you wouldn't want to use one of those.
Using the 76mm piston in a 74mm block, with the 77mm crank offset ground 1mm for a 79mm stroke would give you 1432cc
I wonder if you could find a little bigger piston?
Anther 1mm bore should give you an extra ~40cc

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PostPosted: Sat Feb 10, 2007 5:28 pm 
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Bozo the crying clown

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i wonder if you could fit 78mm pistons? because i know where to get some light, strong, short pin height, slipper skirt hypereutectic ones for cheap :P

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PostPosted: Thu Feb 15, 2007 1:38 am 
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Location: Melbourne
depends what your budget is?

If you want a true 1500 with average rod stroke ratio using the g13 you can use the honda d15 crank fits straight in which will give you 1500cc.

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 Post subject: Hey
PostPosted: Fri May 04, 2007 11:11 pm 
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Joined: Thu Jun 15, 2006 1:25 pm
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Location: INdia
Hey,

To destroke a G16 cant you just use the G13B connecting rods or some other ones which are shorter?? To increase the compression you could phase the block.. Think that should be enough

Cheers

Slash


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PostPosted: Tue Jan 22, 2008 8:48 am 
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sportage4x4 wrote:
i wonder if you could fit 78mm pistons? because i know where to get some light, strong, short pin height, slipper skirt hypereutectic ones for cheap :P


Where? please let everyone know or me at least :shock:

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PostPosted: Tue Jan 22, 2008 6:27 pm 
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Joined: Mon Mar 12, 2007 5:27 pm
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Location: Brisbane
d wrote:
sportage4x4 wrote:
i wonder if you could fit 78mm pistons? because i know where to get some light, strong, short pin height, slipper skirt hypereutectic ones for cheap :P


Where? please let everyone know or me at least :shock:


Bike pistons of some description?


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