Destroked 3.8 series 1

I was wondering would it be to destroked down to like a 215 cc with 3.3 crank?

if so you would beable to run twice as much boost because of lower compression, there would be less heat and vibration due to the smaller strock...

Are the 3.3 block and 3.8 block the same? And what else would need to be done to do this if it wss possible?

Pipes wrote:

if so you would beable to run twice as much boost because of lower compression, there would be less heat and vibration due to the smaller strock...

Less displacement will appreciate the affect of the blower if anything. Think less displacement = less space to soak in the boost from the blower. Compression comes from the quench area between the piston at TDC and the head. The length of the stroke isn't really a factor.

I wouldn't expect the gains to be worthwhile. Displacement is still displacement, and even if you made the custom rods/pistons combo you would need to get the piston up to the top for a full exhaust stroke, without as long of an intake stroke you don't get as much air into the piston. (that's assuming you could directly swap cranks, you would still need custom rods and pistons)

The stroke length absolutely calculates into the compression ratio. The size of the combustion chamber and piston dome shape all affect the final ratio as well.

There are other ways to lower compression like adding head saver spacers to increase the size of the CC, or overboring the cylinder, or using a piston with a larger dish... etc.

But in the end, I don't think you would not see the hp payoff you are looking for. The $ to HP ratio is going up. There are too many other proven methods to increase power output on these engines that will cost much less than custom rods and pistons... bigger cams, more efficient blowers, turbos, etc. Understroking wouldn't be worth the $, it would be much easier to cam/turbo/etc.

It was all a dream... That I had thanx for imput

In the words of Big Daddy, "There is no replacement for displacement"

ghpcnm wrote:

In the words of Big Daddy, "There is no replacement for displacement"

ghpcnm wrote:

In the words of Big Daddy, "There is no replacement for displacement"

Except Forced Induction

thats what is thinking larry70gs more and the djiplacement wouldn't even a big issue i thought

Forced induction is just increasing the displacement with heat. So still, there's no replacement!

You want to listen to Dave, who has quoted the famous man who lost part of his foot when his clutch exploded due to the excess HP he was attempting to run through it. That was the last time he sat behind his powerplant.

De-stroking would be a waste of time and money. Now stroking it, that can make some impressive power. Especially on the series one where it can be stroked to 4.2 liters and have pistons no shorter than the series 2 ones.

how can i do that? whats all need. got an extra block that i can do it to. how much hp and torque would it make?

http://www.3800stroked.com/

pricey. But the taller deck on the series one with the h-beam rods could handle very impressive boost.

thanks karma for site... but one more ?... Is the crankshaft custom? i havent seen any buick v6 engine with a 3.700 stroke and also the GN stroke was 3.765 if not mistaken from which engines crankshaft did the use to stroke it with?

its custom.

So Karma, which kit were you looking to buy?

in all seriousness,the high boost series one kit is where ill spend my money if my lower mileage build block needs anything for mains or piston.

Awesome! So how much is high boost according to these kits?

upwards of 29 psi. If she holds.

how would you be able to get that much boost from? i was looking at the high performance stroker kit but its like 3500 without shipping... are there any other places that makes a kit for the series1?

turbo or a proper supercharger. Not a blower as we have. (Though I might see 15-19 with my m112)

Most(if not all) of the aftermarket 3800 stuff was R&D'd in Australia for their Holdens. Then ported over for us in North America with our wrong wheel drive and wrong way around engines. Come racing in AU were really the only ones to design the stroker kit and then licensed it to 3800stroked for North American resale. Its expensive because its a very specialized modification for an engine that really only got attention for modification in AU, has had quite an amount invested in the design and testing, can handle high boost reliably ,and for what you get and how rare modding these engines is getting now-a-days; I'm surprised that its not more expensive. So no there's really not any other place to get a kit. There is some speculation that with the series one you could use the shorter series two pistons and then the crank from some other GM beast that escapes my memory at the moment, but you will be cobbling so much together don't expect it to hold boost very reliably and I don't think anyone ever did it.

Edit:
Some info on when INTENSE was thinking of doing a stroker kit:
http://www.3800pro.com/forum/bottom-end/5127-got-crank.html

ok everything comes from down under. are you currently running the m112 on your series 1 in a riviera or on a project car?

yeah, no m112 running yet. I seem to keep doing blowers and projects for other people. Need to get back to my own.

so you do your own porting and polishing? ive been trying to do a port match on my intake plenum and heads but i dont wanna mess them up ive heard that the water jackets are very weak once you do them. is that true? i really wont them done by someone that is experienced. is it hard to do a complete port and polish i wanna get the most out of them.

I've ported the odd thing...