Hey guys... I was wondering....I want to build my bottom end on my SOHC and Im thinking going JG, the question I have is that he has a couple different kits out there, one of them is running like an 11:1 comp. ratio. That is made for a turbo running about 18-30 psi. Or should I get a pkg with a lower compression. My goal EVENTUALLY is to totally and soley race my car. I wanna stay SOHC and go as far as I possibly can. My goal 9 sec. Let me know what you guys think. Thanks in advance........


[Modified by fmaxturbochic, 3:07 PM 2/27/2003]

 

if you plan on driving it everyday, reliably, do not take the compression over 10 to 1. if you currently are using the T3/T4 turbo, i would not boost more than 10 pounds on the stock internals, especially on a single cam motor.

where did you get the magic number of 18-30 pounds of boost?

why are you insisting on the single cam build?

 

I thought the higher the compression, the less you could boost...

 

you could essentially run 12:1+ and boost if you have the correct tuning, proper fuel and such... Not pratical IMO for streeters. I've seen a SOHC with 9:1 and a T3-T4 run really well on 10psi for a while, then he turned it up and went boom. good luck.

 

When you start talkin about 25lbs+ with even 9.0:1, the problems don't lie in the first things that you might think of... YES you do have to have the block sleeved to handle all the extra force that boost gives ya.. pistons, rods, headwork, etc... But I highly doubt that you could run 11.0:1 and boost as much as you want... The first thing that will begin to leak is the headgasket... If you have that much boost then you gotta watch the rings too.. I know you have all probably heard this but my friend's new GSR motor has been sleeved/o-ringed to 84mm by GE, running JE 9.0:1 slugs, Crower rods, a Portflow turbo head, and some other ****... Anyways he's still workin on his turbo setup itself.. We were gonna run a T04X^2 but that AR is too much so we're thinking a T4/60-1 He is also planning on squeezing 100... So we're hoping for 600-650 daily driven whp... I personally don't like these lower compression daily driven turbo motors, for myself I would build it with 10.0-10.5:1 and boost less.. I'm sure that we'll be able to get that kinda power because my other friend old GSR turbo motor was the exact same as this new one except not o-ringed and no nitrous... In his EK he made 506whp on 22lbs and 92 octane... That was also at 11 degrees of timing so we could have gotten more... O-ringing will help more but with those numbers you are talking i just don't think it's too possible... Also, why do you want to stay SOHC??? I'm just curious but all I really work with and build are B series VTEC motors.. I don't know, that's just me tho... Good Luck with whatever route you take...

 

Here's some food for thought. A boosted SOHC daily driver.
ENGINE:
Type: 1.55L Honda D16A6 SOHC, bore/stroke, 2.97/3.35 inches
Induction: Eaton M-62 supercharger with carbon rotors, ported and timed; hand-fabricated intake manifold, Endyn boost control (27 psi)
Fuel System: Endyn/Honda electronics, 12-psi Bosch pump, RCE 550cc injectors
Cylinder Head: Reworked Honda D16A6; Del West 1.18 intake, Ferrea 1.06 exhaust valves
Camshaft: Endyn/Web: 0.425/0.420, 228/230 intake/exhaust, respectively; custom valve springs, titanium retainers
Pistons: Endyn/Wiseco Roller-Wave (forced induction style), 11.2:1
Rods: Eagle H-beam
Crankshaft: Moldex destroker (to improve rod angle)
Ignition: MSD, J&S SafeGaurd
Exhaust: Kamikaze 4-into-1, 1.75 primaries, 2.5 collector 3-inch catalytic converter w/3-inch Thermal Research & Development exhaust system

For those who do not know this is Larry Widmer's old car. While my opinions of the guy himself may be mixed I think that this is a respectable build-up.

 

What a CRAZY lil single cam... haha j/k.. sounds like it would do pretty good... Anyways I'm just not with supercharging because they run too inefficient... If you are running boost then you atleast heed to have it go through an intercooler of some sort... The high temperatures that a supercharger generates take away from the boost affect which in turn doesn't generate any power... That's just my opinion and experience with them... TURBO baby... haha

 

Yeah I tend to agree with you for the most part, I am actually an N/A finatic. I just remembered seeing this in an old HOT ROD mag so I thought I would share.

 

High Compression with Turbo. KABooooooom. One or the other usually thing that are good for all motor setups arnt for Forced Induction.

Btw: for sticking with the single cam


[Modified by SlowSOHC, 8:35 PM 2/26/2003]

 

tru tru.
________
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well beimg that your goal is set very high, in the 9s. id just like to point out what people doing nines are running. most of them are hitting at least 12.1 compression with a fat turbo running at least 30 psi. so i have never delt with this subject first hand but the pros are doing high comp. high psi. good luck.
props for the sohc.

 

9 second 1/4 in an street driven EX with the SOHC?!? Is that even possible?

 

only in the mind of newbies.

 

I agree... hahaha