manifold enquiry

topcatcustom · Post by **topcatcustom** » Wed Nov 18, 2009 1:08 pm

5 bar or 5 psi?! 5 bar is about 70psi!!!!

stevieturbo · Post by **stevieturbo** » Wed Nov 18, 2009 1:13 pm

try 5 bar

slots anywhere really, thats just a massive design weakness. Slots in the skirt, or equally important if not more, slots behind the oil control ring.

They will not last IMO.

Whilst not ideal, even if you can buy some off the shelf quality pistons, and skim the crown a little to help reduce CR. At least the actual piston design will be strong.

bones · Post by **bones** » Wed Nov 18, 2009 1:33 pm

i was told 5 bar, but i think he had about as much of an idea on turbos as ive got, which says it all

. so those pistons are no good then, so looks like pistons will be forged,just need to decide on what engine size??. what sought of comp should i be looking at with using a blow through carb. lower the better??

stevieturbo · Post by **stevieturbo** » Wed Nov 18, 2009 1:41 pm

compression is very dependant on power goals, ignition setup, intercooling used etc.

Lower is most certainly not better.

I'd say for most cases, using mapped ignition with decent intercooling go no less than around 8.5:1.

Engine size is totally up to you.

Boosted LS1 · Post by **Boosted LS1** » Wed Nov 18, 2009 7:46 pm

Slotted rover pistons crack at 10 psi so imo you could use them happily at up to 7 psi which is actually quite a big performance increase.

It doesn't pay to skimp on pistons if you plan further upgrades though.

bigaldart · Post by **bigaldart** » Wed Nov 18, 2009 10:43 pm

I think that is 0.5 Bar if they are good for 5 bar no one would ever use forged. 0.5 bar is 6-7 psi. Depends on what the target is.

Alan

bones · Post by **bones** » Fri Nov 20, 2009 10:03 am

i guess we can all assume i got the 5 bar thing wrong

. what would 7psi be in bhp in a 3.9 rover using intercooler and a 600dp carb (which was built to used with a procharger ),

rich

kiwi303 · Post by **kiwi303** » Fri Nov 20, 2009 10:27 am

well, standard atmospheric pressure at sea level is 14.7 psi, so 7 psi is about +45% on N/A pressure, so figure the engines are a bit less efficient, and call it between 30% and 40% more power than unboosted. A lot will depend on your valve timing and ignition setups.

stevieturbo · Post by **stevieturbo** » Fri Nov 20, 2009 1:13 pm

bones wrote:i guess we can all assume i got the 5 bar thing wrong . what would 7psi be in bhp in a 3.9 rover using intercooler and a 600dp carb (which was built to used with a procharger ), rich

600 DP is too big for blow through on a RV8. I could never get one to work right. I ended up with a 465 modified for a DP.
The 600 would only work when half the carb was used.

Use a smaller carb.

bones · Post by **bones** » Fri Nov 20, 2009 2:15 pm

Ok then the easiest thing is for someone to explain the best way and a cheap way of getting 500bhp from a rover v8, using a blow through carb set up or carbs if su,s are ok and an intercooler. And please reply as if writing a book called ,turbo'ing for dummies.

I thank you.

berty · Post by **berty** » Tue Dec 01, 2009 6:06 pm

bones i have got a set of log manifold for the rv8 mate if you want to see picture i can post them up