re building a H22a4 block for JRSC @6 PSI - Honda Prelude Forum

soon2bsh · 02-15-2004, 07:52 PM

I need help, I have a block thats in the process of rebuilding and im stuck on what type of pistons I should use. I already have a set of JE 9 to 1 CR but is the compression to low for a JRSC @ 6psi? should I get different CR pistons or go stock? and is any aftermarket head gasket okay to use? My goal is to squeeze 210 to 220 whp outta my motor?
Here are the items I have waiting to be thrown on to the rebuilt motor after initial breakin period (3000 miles):

JRSC @ 6psi (jr fuel regulator/pump)
dc headers
tanabe catback exhause
AEM cold air
MSD 6AL (do I really need this)
ngk platinum plugs
ngk wires
ACT clutch (organic, stage2)
ACT flywheel
LSD Quaife (optional) Can anyone tell me where to get a good deal on this)
EGT gauge
A/F Ratio Gauge
Boost gauge

Any recommendations would be considered guys
thanks

h22 bb6 · 02-15-2004, 07:57 PM

9:1 would be fine. If you also do things like rods and such, you could build it to run 9 psi safely. Then your problem would be internal engine temperature.

soon2bsh · 02-15-2004, 08:05 PM

what do you mean by rods and such?? I am thinking about going 9 psi in the future? Can someone answer my questions thoroughly please?

MugenPoweredLude · 02-15-2004, 08:06 PM

yea, IMO if your building your block, get a Hondata Stage2b and run 9psi

also, i would toss that DC header, get a Kamikazee(i think thats the one for FI) and a custom 2.5" exhaust
PM sharkcohen about the JRSC and anything about it...he'll tell you what you need to know

MugenPoweredLude · 02-15-2004, 08:09 PM

Quote:

Originally posted by soon2bsh
what do you mean by rods and such?? I am thinking about going 9 psi in the future? Can someone answer my questions thoroughly please?

well you say youre building your block, which to us means, resleeving with iron sleeves, GE or Darton, and going with JE pistons.....might as well and get connecting rods....actually i think its a must....i havent seen or heard of aftermarket pistons with stock rods but i might be wrong

h22 bb6 · 02-15-2004, 08:11 PM

Quote:

Originally posted by MugenPoweredLude

well you say youre building your block, which to us means, resleeving with iron sleeves, GE or Darton, and going with JE pistons.....might as well and get connecting rods....actually i think its a must....i havent seen or heard of aftermarket pistons with stock rods but i might be wrong

Thats basically what I meant. There is alot more to building a block then just replacing pistons. If your going with a lower compression piston, I believe you have to resleeve the cylinders. You also will want to get aftermarket replacement connecting rods, because with FI it is easy to break them.

soon2bsh · 02-15-2004, 08:12 PM

does anybody have a built bottom end for the JRSC? gimme your specs and mods and how is it running?

h22 bb6 · 02-15-2004, 08:14 PM

Quote:

Originally posted by soon2bsh
does anybody have a built bottom end for the JRSC? gimme your specs and mods and how is it running?

Probably have better luck searching the FI forum. No one comes to mind with a built bottom end with the JRSC. I'll see what I can dig up though.

MugenPoweredLude · 02-15-2004, 08:15 PM

havent seen many if any bottom ends built for a JRSC...maybe 1 but i forgot who it was and it was on another forum

seems you might be a bit confused on what to use....may i suggest talking to dave(sharkcohen) and doing a bit more research
basically youre going to want to build the bottom end like you would on a turbo motor

soon2bsh · 02-15-2004, 08:19 PM

What I meant by building my block was just throwing low compression pistons in them. I really dont want to shell out that extra cash to resleeve and all. Is it okay to just throw in the JE 9 to 1 CR pistons with stock rods withough resleeving?

MugenPoweredLude · 02-15-2004, 08:21 PM

Quote:

Originally posted by soon2bsh
What I meant by building my block was just throwing low compression pistons in them. I really dont want to shell out that extra cash to resleeve and all. Is it okay to just throw in the JE 9 to 1 CR pistons with stock rods withough resleeving?

no you cannot do that
forged pistons + FRM sleeves =

i suggest re-thinking your approach and doing a lot more research
not trying to sound like an ass but it will save you the headache and money wasted down the line

Girl n-a Lude · 02-15-2004, 08:21 PM

i spoke with doug at hondata about the stock block and 9lb boost when we were tuning. we both agree that keeping stock compression is fine as long as the internals were stronger. i could understand lowering compression for big boost like a nice healthy turbo within 15psi or something, but given the limitations of power from the jrsc...why lower compression and lose power? Its not a matter of if, but when my motor blows, I will be rebuilding with stock compression in mind.

If nothing else though, I would suggest getting the hondata intake manifold gasket...it'll keep the temperatures about 20-30 degrees lower and reduce heatsink.

soon2bsh · 02-15-2004, 08:25 PM

so are you guys saying either i go with a fully built block resleeved and all or just go stock?

MugenPoweredLude · 02-15-2004, 08:27 PM

Quote:

Originally posted by soon2bsh
so are you guys saying either i go with a fully built block resleeved and all or just go stock?

bingo

if you go stock block or not, get in touch with sharkcohen or Girl n-a Lude
both are very knowledgeable and can help you a great deal with the JRSC

soon2bsh · 02-15-2004, 08:36 PM

Girl n-a Lude did you build your bottom end? im assuming you did cuz youre running 9psi? hows ur Lude running? I have a friend that works at SP engineering you think I can maybe check out your ride sometime?

MugenPoweredLude · 02-15-2004, 08:38 PM

Quote:

Originally posted by Girl n-a Lude
the stock block and 9lb boost Its not a matter of if, but when my motor blows, I will be rebuilding with stock compression in mind.

her motor is not built.....yet

h22 bb6 · 02-15-2004, 08:46 PM

Like Anthony said, building your bottom end is no different than the guys that do it for turbo's. Here are some links:

Great link for what caused engine failures:
Who's motor went toast with FI and why

This guys buildup is nuts but gives you somewhat of an idea:
cheapest turbo setup

10:1 CR vs. 9:1 CR:
10:1 vs 9:1 CR

Good build thread:
whats the cost of FI engine build?

Hopefully these help you out.

Girl n-a Lude · 02-15-2004, 08:47 PM

i am running that thing on a stock block and so far there has been no problems. i suspect it'll go when i start tracking it and it'll be seeing skyrocketting temperatures lol. but for now, money is being spent elsewhere on it.

san, what engine management do you plan to use? if you do plan to jump up to 9, a standalone is a must. you can check out the car, im on the area...its just sitting at the shop right now getting some stuff done. i dont know if i will need to go back to stock temporarily to get some fix it tickets taken care of as of yet.

h22 bb6 · 02-15-2004, 08:48 PM

Quote:

Originally posted by Girl n-a Lude
i am running that thing on a stock block and so far there has been no problems. i suspect it'll go when i start tracking it and it'll be seeing skyrocketting temperatures lol. but for now, money is being spent elsewhere on it.

Whatever happened with the custom intercoolers?

Girl n-a Lude · 02-15-2004, 09:05 PM

I'd like to know that too hahah . Whoever was designing one decided to sell their lude and cut their modding costs...I dont know if he ever finished. there's no one in my area that I trust in fabricating an intercooler, and I dont want to rely on my own knowledge as well haha. Maybe in another year or two when I get more access to equipment at school and pick up more info I would try...but I'm a lazy mofo