Alright guys, I need some expert advice here. What will the impact be of switching to a 11:1 piston in my F22B1? Are stock rods safe for this compression ratio? Will I run into detonation problems (even if I run a colder plug and 93 octane)? What other considerations are there when jumping up so much in compression? I really need some of you all-motor guys to respond with some sound advice.

I have had a 3-angle valve job, port and polish and intake manifold port matching on the top half. Also milled .008 (to make it flat again after a blown head gasket).

Thanks for any direction you can provide.

-Brent

 

Stock rods will be fine, but I would suggest that you upgrade them. IIRC, F22 rods are quite weak. If you decide to keep stock rods, add ARP rod bolts.

Detonation will not be a problem with normal temp plugs and 91+ octane.

 

So, you see no issues with installing these pistons? I take it that the ARP bolts are just a stronger bolt? To be honest, I can't afford new rods right now. As long as I don't do something stupid, like boost it with that compression, I should be ok?

 

u may want to change your cam to maximize performance
but otherwise the fuel octane and ignition timing settings are your main concern. also, u may want to raise fuel pressure, unless you get injectors.

~boom

 

Thanks for the response. As far as damage to engine internals, if I run high octane fuel, and set the timing appropriately, it seems like there shouldn't be any premature wear on the motor. Am I correct in this assumption? What about rod bearings? Just replace with stock when putting the motor back together?

Anyone else see any red flags with this project?

 

I would suggest some kind of fuel managment.
-PHiZ

 

Honestly, I'd be tempted to wait on a rebuild until you could afford rods. With the redone top end, rods are going to be your only weak point rev-wise.

 

Yeah, I thought about that, too. But I can do that after I put this thing back together. Right now my big concern is getting the internals right. Just for info, though, what type of management are you talking about? Like a VAFC, or more along the lines of fuel quantity upgrade (injectors, pump, rail)?

 

Aaaahhh... you're killin me

I want to drive the car this summer (hopefully by the end of the month, actually). Don't get me wrong, I want input like this, but are you coming from a track/racing perspective, or do you think rods are a necessity just for some occasional fast accelerations onto the highway? What if I were to keep the revs at/below redline?

Thanks qtiger, keep it coming, man. I need all the advice I can get right now. This is the critical decision making stage!!

 

i hardly think the rods will be your main concern with the rev limit. the head, especially a SOHC head is going to have trouble getting the job done. you will probably pop a spring before 8000, maybe lower.

~boom