More Stroke

[H23CB7]

I have a couple questions to ask but i will wait to see some answers on this question first.

Will more stroke help with adding more power to an engine?

[NorcoAccord]

what do you mean more strokes?

[NAiL05]

Usually it will. But how much more are you going? You have to match it to your head profile and such so you prevent piston to valve contact and such but I am pretty sure you know that.

[H23CB7]

alright well i have an h22a and i had a thought and did little research to see if i can give it more stroke.

I don't want to feel like an ass but hey i gotta ask

Now the h23a1/f22b/f22a cranks and rods are the same. so with that being said. Could i possibly put one of those cranks and rods into an h22a with stock h22 pistons???
I know stock is 90.7 stroke and the others are 95.
and those obviously have a shorter rod length compared to the h22
So would that work ok in an h22 block with no problems? Or would the pistons come up to high?

[H23CB7]

I think this actually answers my questions.

http://www.cb7tuner.com/vbb/showthre...ghlight=stroke

But let me know if that thread is right or not.

Thanks

[H23CB7]

I think this actually answers my questions.

http://www.cb7tuner.com/vbb/showthre...ghlight=stroke

But let me know if that thread is right or not.

Thanks

Still want to know if this is going to work right???



But is this going to hurt my top end, or am i sacrificing anything just to get more stroke???
Thanks again

[preludeman92]

By my math, h23 crank + h23 rods +h22 pistons= Piston out of hole .020". If you get a thick head gasket, I suppose you could do it. You'd net somewhere around a 10.4:1 CR with a .050" head gasket and stock USDM pistons. JDM pistons would net you around an 11:1 CR.

Are you sacraficing stuff? Sure. Trying to rev stuff that high with that large of a stroke can lead to huge problems (i.e. spun bearings). Make sure you have a good oil pump (might as well go with a high flow one), ARP fasteners throughout, and a good tune. I would just avoid over 7k rpm on a regular basis. You'll gain some compression so you can use more cam.

[H23CB7]

yea i would be using my jdm pistons. But if i am going to loose most off my top end, well not all of it, i don't think i will do it. I like having my motor scream till redline whenever i am racing or whatever. So if anyhting i will try to find a spare block and mess around a little with this setup.

[dan21]

By my math, h23 crank + h23 rods +h22 pistons= Piston out of hole .020". If you get a thick head gasket, I suppose you could do it. You'd net somewhere around a 10.4:1 CR with a .050" head gasket and stock USDM pistons. JDM pistons would net you around an 11:1 CR.

Are you sacraficing stuff? Sure. Trying to rev stuff that high with that large of a stroke can lead to huge problems (i.e. spun bearings). Make sure you have a good oil pump (might as well go with a high flow one), ARP fasteners throughout, and a good tune. I would just avoid over 7k rpm on a regular basis. You'll gain some compression so you can use more cam.

just a question why wouldn't it be good to to rev high with that much more of a stroke besides the spun bearings if built right would you say it would be okay

[NorcoAccord]

what about using type s pistons that with bump you right up to 11 to 1 compression.

[avendi]

what about using type s pistons that with bump you right up to 11 to 1 compression.

But if you increase the stroke, the Type S pistons would take the compression way higher than that... wouldn't it?
Or are you talking about just dropping the Type S pistons in without increasing the stroke?

[H23CB7]

But if you increase the stroke, the Type S pistons would take the compression way higher than that... wouldn't it?
Or are you talking about just dropping the Type S pistons in without increasing the stroke?

probably meant dropping in the pistons without adding the stroke. Cause i know that will get you around 11 to 1.

[preludeman92]

just a question why wouldn't it be good to to rev high with that much more of a stroke besides the spun bearings if built right would you say it would be okay

Oh, if you can rev that high and not kill the motor go for it It's just most people won't build it right or will do something stupid.
A longer stroke motor would make more torque at any given rpm (in theory anyways). More torque means more HP because HP= (Torque*RPM)/5250. Even if your start to loose some torque in the top end more RPMs will cancel the torque loss.

All he is attempting to do is build an H23VTEC. The only difference is his build will use h22 pistons and an h22 block instead of a stock h23 bottom end. I've never seen an h23VTEC live long enough or gain enough power for me to justify it being a worthy engine.

Cisco's engine will be different. He's using forged internals, a new bottom end, and ARP fasteners. I still say a spun bearing will be the death of that motor when the time comes. It may not be for a long time, or it may be in 5000 miles. Who knows

When I finish my motor with its 97mm stroke, it won't see 7krpm except on the dyno and maybe the ocasional track day. Then again, I don't expect that much power to be made up there anyway since I'm not going to run VTEC. I'm going to keep the stock f23 rev limit for normal use and I'm trying to find a high volume oil pump. A bearing problem will probably kill this one when the time comes. I don't really care though... I've got $200 invested in it so far. The cams will be $450 with new springs and the tuning will be about $300. If my motor proves to be a good basis for power, it'll get torn apart and custom forged internals will be put in with a VTEC head put on top.

[H23CB7]

Oh, if you can rev that high and not kill the motor go for it It's just most people won't build it right or will do something stupid.
A longer stroke motor would make more torque at any given rpm (in theory anyways). More torque means more HP because HP= (Torque*RPM)/5250. Even if your start to loose some torque in the top end more RPMs will cancel the torque loss.

All he is attempting to do is build an H23VTEC. The only difference is his build will use h22 pistons and an h22 block instead of a stock h23 bottom end. I've never seen an h23VTEC live long enough or gain enough power for me to justify it being a worthy engine.

Cisco's engine will be different. He's using forged internals, a new bottom end, and ARP fasteners. I still say a spun bearing will be the death of that motor when the time comes. It may not be for a long time, or it may be in 5000 miles. Who knows

When I finish my motor with its 97mm stroke, it won't see 7krpm except on the dyno and maybe the ocasional track day. Then again, I don't expect that much power to be made up there anyway since I'm not going to run VTEC. I'm going to keep the stock f23 rev limit for normal use and I'm trying to find a high volume oil pump. A bearing problem will probably kill this one when the time comes. I don't really care though... I've got $200 invested in it so far. The cams will be $450 with new springs and the tuning will be about $300. If my motor proves to be a good basis for power, it'll get torn apart and custom forged internals will be put in with a VTEC head put on top.

awesome. See i don't have the money for a nice complete build right now. I have enough to build it but just not with anything good really. So i think i will pass on doing all this stuff. Although i would like to know what kind of numbers it would have thrown down.

[NorcoAccord]

But if you increase the stroke, the Type S pistons would take the compression way higher than that... wouldn't it?
Or are you talking about just dropping the Type S pistons in without increasing the stroke?

I was talking about just dropping them in.