Hi all.

I want to build a stroked H22 engine but i like to rev high,i know the rod ratio of the h22 its identical to the B18c engine,and its a good rod ratio to rev up...but i want to stroke the engine with 95mm crankshaft, i already search a lot but i cant find any info about the rods to use with 95mm crank and keep the good rod ratio to rev 9k. The rod i think will work good but need some machining its the F20B rod with 5.709" and will give almost a 1.53 rod ratio. Of course also it will need a costum pistons.
Any one can help me out about the right combo for this setup?
Thanks

 

Check my build I did this setup with the 95 crank and off the shelf carillo h22a rods and custom pistons motor goes to 10k no problem

 

what are the specs to your custom pistons? what is the difference between it and a regular h22a piston?

 

10,000rpm on a 95mm crank? What's the life expectancy of that build?

 

Not long....

I'm sure the center main is screaming for mercy in a setup like that @ 10k.

 

ya,thats what i dont want to happen...im using my car for a street use and "abuse" lol...and i would like to keep my rod ratio around the stock numbers because its a good number...even if i put a longer rod of 145mm the rod ratio will be worse. I saw your preparation blade0314, and its really good,but your car its for drag use right? Your Rod leght its the 143mm? For drag use i wouldn't mind using even bigger stroke,but for a street use i need the stroke ratio in the 1,55 minimium so i can rev around 9k and the bearings and pistons don't scream for me lol.

 

So,my indecision its,do i stroke the engine and lose some ratio or do i keep my stock stroke to abuse the high rpm ranges?

Here my espected setup specifications:
h22a block with darton flanged sleeves
87.5mm Aftermarket pistons with 13.0:1 (minimium)
Carrillo LW Rods lenght ??not decided
Crankshaft ??not decided
Skunk2 intake manifold (if you think there is other intake for better high rpm let me know,i was thinking in do a costum one or modify a Edelbrock to fit in h22 head)
Port&Polish Head
Skun2 pro2 complete Valvetrain&Valves
Skunk2 pro2 or maybe pro3
4-1 Costum headers
3" Exhaust
Findanza LW flywheel and Stg3 clutch disc.

I pretend this setup to a high rev engine.

 

cant give away all my secrets

Life expectancy is multiple seasons the build is very reliable
actually the motor is built for this so the motor its healthy

 

Just realised it's a drag motor, not sure how many miles several seasons equates to, but most likely pretty short life expectancy in terms of a street car.

I feel it is perhaps a little misleading to state that a setup is reliable as a drag motor when the OP did not explicitly state that the motor was destined for such use.

Regardless, spinning an engine that fast is impressive if it is reliable for your uses, you must be running some seriously trick pistons to mitigate the forces a 32m/s MPS manifests!

 

mine is 95mm crank with h22 length rods and pistons with the wrist pin location moved up. If you go any longer rod, you'll get the wrist pin into the oil ring groove location. I think I've seen caps that cover that area if the wrist pin goes that high, but haven't had it first hand. Or you're gonna have to deck plate to get a longer rod in there if you're looking for a better rod ratio.

 

I think drag preparations can use the craziest strokes you can run in a engine,thats because the engine will see only a few seconds of wot. The first and biggest causes of an engine failure with a bad ratio is high temperatures on the rings caused by the pistons speed,but revving hard a engine with bad stroke for a few moments ins't that bad as we think because the engine will not heat up enough in that little period of time. But as i said in my first post i want to build a street car,and it will see a lot of miles of high revs.

 

ya,you right,there are caps to cover the oil rings,i already had a B16a Stroked to 1.9 with 84.5mm crankshaft and custom rods and pistons,the wrist pin goes up to the oil ring grooves.
I was thinking doing the same in my h22 and use 145mm rods,but even with a longer rod and costum pistons the rod ratio will be bad for a high rev street car..well,not reallllyyy bad,but bad enough in my opinion...rod ratio would be around 1.53. Not bad,but also not good for reability.