gnxpro24

iTrader: (1)

I know there's several threads that discuss this but, noone ever seems to agree on one answer.
I want to use an m62 or m90 s/c on my h23v build. I planned on using my Type S pistons which, according to Rosko, would put me at 11.68:1 compression with the bluetop rods. He says I shouldn't have an issue boosting on that comp. ratio but would like some other opinions. Would I be ok or should I ditch them S pistons and use the stock 10.6:1 pistons, or use forged 10:1s (which would be 10.6:1 with the bluetop rods unless I use an h22 crank so forged rods can be utilized)? Plan on running 10-12psi at max (most likely) since anything more will cause some serious heating have Hondata s300, all the fuel upgrades I need, and will be getting the cams degreed and the engine tuned right after its built and swapped.

gnxpro24

iTrader: (1)

Anyone?

F22Master

Purpose of car?
Fuel you plan to run?

gnxpro24

iTrader: (1)

Mostly street car. 93 octane

Schister66

Fuel grade is ultimately the limiting factor here. Also, are you running an intercooler or some kind of chemical cooling (water/alky injection) to cool the intake charge off the SC?

To answer your piston choice question, I would opt for a forged piston over a stock one. Are there any off-the-shelf pistons available in the 10+ CR range for your setup? I would still keep the compression in the mid 10s or higher, if possible.

Again, your choices really hinge on fuel choice and intake air temps off the SC

Dark_Teg

If you are running a JRSC keep the compression under 10:1, they don't like high compression.

If running a Centrifugal SC I would go 10-11:1 they like compression same as a turbo.

gnxpro24

iTrader: (1)

No intercooler or way of cooling, unfortunately.

My two options right now are:
Use my H23a block and Mahle Gold pistons OR
F23 block bored to 87mm with forged pistons

Unless I can find other, both pistons are 9:1 comp.
Either way Ill probably be ditching the H23a rods and crank for H22 forged rods and oem crank

gnxpro24

iTrader: (1)

Gonna be running an Eaton M90. I thought they made nice power with higher comp?

wunfstgsr

Higher comp is fine these days just have your tuner tune it properly, I had a high comp JRSC setup years back made great power 11+ comp, flat valves ect.. never had a issue. Im using a centrifugal sc from Pro charger on my stock ITR block and it loves high comp and a high rev limit as it creates more power as boost rises in rpm. You can make more power with less boost with a higher comp. I suggest incorporating a water to air intercooler for your setup, theres a few different designs you can use if you have a tight area to work in the engine bay, Theres a barrel style you can easily fab in-between the charge pipe.

gnxpro24

iTrader: (1)

Interesting, I thought the same thing about the higher comp. and less boost, etc. but, Im no expert.
Any links on these setups? Im not seeing anything other than the LHT intercooler that is way out of the budget, haha.

wunfstgsr

Just search through the F.I threads there was a few threads with this same question.

If you have a JRSC which i assume read this huge thread!

https://honda-tech.com/forced-induct...nning-1214810/

Heres my multi SC build threads.

https://honda-tech.com/appearance-bu...2A%2A-2556604/

gnxpro24

iTrader: (1)

Thanks. I read you were against Pro1s that's what I plan on running... They're supposed to make awesome power gains especially with boost.

wunfstgsr

They kept the static compression down but were a bit to much for the setup, would of been better to use a bigger throttle a ported head and a better header on that setup i had with those pro 1's. But your setup might be a bit different so idk.

Dark_Teg

Trust me on this. I have lots of Eaton experience being a long time Lightning owner. Eatons make a lot of heat and don't like high compression. If your going E85 you probably wont have issues but if on pump gas I would keep it under 10:1 with an Eaton.

gnxpro24

iTrader: (1)

I found some CP 9:1 forged pistons and Manley rods
It's dual purpose, if I ever wanna turbo it, it should be able to handle almost twice the power I'll be making with the s/c. At that point the sleeves will be the weak point but, I'll worry about that later.

gnxpro24

iTrader: (1)

Any other opinions on the Pro1 cams? I know they make great power with turbo but, I was reading about losing power with s/c due to valve overlap. I thought I could correct this by getting the cams degreed in when tuned. Planned on switching over to a turbo setup within the next two years so I want to keep the Pro1s if possible...

gnxpro24

iTrader: (1)

Anyone?

Schister66

I'm not sure on those particular cams, but cam choice is based off flow rate for the turbocharger you're planning to use (and the power you plan to make). I would imagine then that any cam for a 300whp turbo setup would also be a decent cam for a SC setup. If you run a cam with a lot of overlap, you'll be shoving boost pressure through the cylinder rather than into it and degreeing them can help, but there's not much to 'adjust' if the duration is too long.

but again cams are not my bread and butter... someone smarter than me chime in

gnxpro24

iTrader: (1)

Another Sheetz opened locally and they carry E85..Ive reevaluated my goals and have decided to do a turbo setup instead..
JE 9:1 pistons
Eagle Rods
Iron sleeve block
Pro1 cams
Supertech valve springs and ti. retainers
Crower ss valves
Euro R manifold 70mm tb
AEM fpr

Gonna get some 880+ injectors and all the turbo components Ill need

Im shooting for the 4-500whp range on E85. What would be a good turbo to achieve this? Im looking at a BMS top mount manifold, hoping it will clear my full rad setup in my ek

Dark_Teg

I would go with a GT30R variant for 500whp.

NotARaCist

iTrader: (1)

Yeah, a 3076 wouldn't be bad. If you don't already own those pistons, then step up to a 10:1, if not higher. You're gonna need more like a 1300cc/min injector for 500, though - 880 won't cut it unless you kick the pressure up into the 90's, which is just begging to blow something up.

gnxpro24

iTrader: (1)

Since Im on a budget, Im trading alot of my current setup for turbo goods. Found bnib 9:1 JEs and Eagle rods for $500, cant pass that up considering 10:1s are $600 for just the pistons.

I guess Ill stay tuned with whatever turbo I get offered, Im not very educated when it comes to forced induction and am studying as much as I can to learn. I usually study ten times over before I buy/do something.

Ill probably have to stay below 500whp with the stock sleeves (F23 bored out to 87mm).

NotARaCist

iTrader: (1)

Check the FAQ sticky for a "how to" on turbo size choice. Also, check these links.

http://turbobygarrett.com/turbobygar...Tech%20101.pdf
http://turbobygarrett.com/turbobygar...Tech%20102.pdf
http://turbobygarrett.com/turbobygar...Tech%20103.pdf