Hey Guys I need some input on things. Yesterday I called RS Machine, man those guys are great, Mike and myself were talking for an hour *thank god I have long distance on my phone* He's Been building engines for 30 years, so I would take his word and recommendation in a heart beat. I just had these questions on my mind still.

My intended goal is a 300-350 whp car, that's daily driven. (inline pro mani and precision SC34 turbo probably)

I have a B16A2 that's getting RS Sleeves and Arias Pistons.


1. Mike Suggested I go to 83mm bore instead or 81mm (stock), to me this makes no difference, and I know I'll make gains from the bigger bore, but is there really anything wrong if I stay at 81mm?

2. I can't decide on 9:1 compression or 10:1. Mike suggested 10:1, in the sense that I'd loose power down low where 90% of my daily driving is done. I saw his point, but 9:1 to me is safer and less detonation prone.

3. Also I'm going to go with Manley Rods, he said that crowers ($600+ ones) are 100 grams more in weight and kinda heavy. Now Again something easy in my eyes turned into a rod discussion (which was cool). Any thoughts?

Anyone help me out? Im looking to send my block out this week.
Thanks - Fred

 

1. Go with 83mm, your B16 will lvoe the extra displacement ( torque). You still have rooms to enlargen the bore in the future, 84, 84.5mm and etc

2. 10:1 It's your tuner's job to make sure your motor is safe and less prone to detonation. I ran 9.8:1 and would not go any lower...

3. Manley rods is the heaviest out of all that I know....crower weighted less that Manleys, Tony1 weighed them before and the manley is so heavy...Manley is at 517 grams each...I'll tell you what Crower is tmw

stan

 

well with a bigger bore, you'll increase your displacement, and that will of course lead to more power, however, there isnt anything wrong w/ keeping the stock bore, you just wont make much torque . Is the reason you want to stay 81mm because you already have 81mm pistons? if thats the case, id just say keep it 81mm.

If you're only looking to make 300-350, 9:1 compression will be just fine. Of course you'll make more power w/ 10:1, but the margin of error when tuning is smaller w/ higher compression.

as for the rods go, i plan on using Pauter Rods for Luis' prelude, and those are even more heavy than Crower, they are just so beefy, i think they are worth it.

 

i'd go 83mm personally, more displacement off boost power etc.

10:1 with hondata tuning.

manley rods dont know much about them (outside of ford applications) but havent heard much bad.

 

cool, thanks guys

 

up

 

I would go with 83mm bore.
10:1 compression. <- really depends on how good your tuner is. 9:1 is safer and more margin for error. Can you go with something inbetween (9.3:1-9.5:1)?

 

on the bore. 83mm. B16a's need some more displacement.

as for compression. its up to u. on pump gas, 9:1 will allow more boost and more power. 10:1 will be more peppy and make more power per psi, but you won't be able to push as much boost on pump. Compromise and go 9.5:1?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DIRep972 &raquo;</TD></TR><TR><TD CLASS="quote">Compromise and go 9.5:1? </TD></TR></TABLE>

I was thinking of what Stan said too with this 9:8:1

 

i definatly say 10:1. People often get confused and think 10:1 is high, but its actually mild compression I say. Look at all those succesful stock ITR's running 10.6:1 and making good power. Anything lower is for people who run things like FMU or AFC hacks. Just my 53 cents.

Good luck with the build up!

 

I have 84mm RS with 10:1 plus some head milling, coming in around 10.5-7:1. With all of the headwork and flywheel, I come off the line like an all motor car on steroids and by 5k the grin breaks out!

When I called about 2 years ago I asked for 9:1 pistons also, but ended up with 10:1. Definitely the better choice!