Ive been thinking hard about my rebuild. i have a 90 crx si with a b18c1 swap. its currently down but ive been looking into boring and stroking the bottom end. now with the eagle stroker kits ive been looking at, the 92mm crank and the 95mm crank both use the same pistons and rods, considering its the same compression.

what i want to know is how do go about compensating for the increased stroke? a stock p72 piston is flush with the deck of the block at TDC, so when you increase the stroke, the piston would surpass the deck of the block, unless you changed the piston height. so why does the eagle 92 and 95 crank use the same piston?

also, when boring the cylinders, what's the best thing to do with the combustion chambers? if i leave it alone, its seems like the sharp edge would get hot and serve as a source for pre-ignition, even if i did use a bore-matched hg.

I know it seems dumb, but somebody fill me in on this one.

 

Youre sure they use the same piston? Part number is listed as the same? They probably just use a different compression height for the 92 vs 95 deal, with both kits having LS length rods.

If you have the cash, I would look into a Crower stroker kit. The EAGLE cranks I have seen require d alot of TLC before I would even THINK of running them.

 

yeah ur probably right about the pistons, that's the only way it would work.

What kind of problems have you seen from eagle cranks? The crower kit is $400 more than the eagle kit. u really think 400 bucks is worth saving the hassle. i'll be have a reputable machinist putting together the bottom end.

so anyone know from experience about what all is involved in the boring of a motor to run its top?

 

This is what I experienced with an EAGLE stroker kit...

1. First , they included Prelude (H22A) length rods in the kit. Supposed to be LS length.
2. The cranks journals were waay to big to run even "loose" honda bearings.
3. ZERO thrust clearance.
4. 2 of the 4 rod journals (cylinders 2 & 3 to be exact) were the wrong width. By several hundred thou, you couldnt even fir the big end of the rod over the journal.
5. JE makes a custom piston for the kit specifically for EAGLE to their specs. I encountered a problem with their oil ring set (which included a support ring) and it was a HASSLE to get it straightened out.

Did I spend $400 on machine work to straighten out the situation? No, but it was close. Would I have spent $400 to make the whole build go alot smoother?

In a heartbeat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">This is what I experienced with an EAGLE stroker kit...

1. First , they included Prelude (H22A) length rods in the kit. Supposed to be LS length.
2. The cranks journals were waay to big to run even "loose" honda bearings.
3. ZERO thrust clearance.
4. 2 of the 4 rod journals (cylinders 2 & 3 to be exact) were the wrong width. By several hundred thou, you couldnt even fir the big end of the rod over the journal.
5. JE makes a custom piston for the kit specifically for EAGLE to their specs. I encountered a problem with their oil ring set (which included a support ring) and it was a HASSLE to get it straightened out.

Did I spend $400 on machine work to straighten out the situation? No, but it was close. Would I have spent $400 to make the whole build go alot smoother?

In a heartbeat.</TD></TR></TABLE>

and this is a man that does machining for a living. a average joe like you and me that extra 400$ would be a safe investment.

 

thanks for the good info.

 

Oh, another thing, the keyway for the crank was cut off a few degree's. This is something you would never be able to spot with your naked eye, but I was degree'ing some cams in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">Oh, another thing, the keyway for the crank was cut off a few degree's. This is something you would never be able to spot with your naked eye, but I was degree'ing some cams in.</TD></TR></TABLE> It always amazes me how some companies in the business of making parts in many aftermarket situations choose to run their production that gives them such a uncontrolled end product. It also makes me wonder what engineering design principals are actually utilized up front.

 

i've lost a lot of respect for eagle products. u ever had any problems from crower's stuff?

 

I think Todd (b19coupe on this forum) used a 92mm Crower crank on his latest build. Aside from having the journals machined for the clearances he wanted, I dont think he ran into any other problems. Maybe he can chime in here with his experience.