Comp. ratio for a 347 w/ Kenne Bell

BlueSaph95GT

Member

Sep 16, 2003

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Oak Lawn IL

May 11, 2008

#1

• May 11, 2008

• #1

What kind of compression ratio would best benefit a 347 with a kenne bell blower? We're talking Boss b-based project here...no stock block; mild boost (no more than 10 lbs max) - pump gas and streetable stroker/blower 347 combo. Ideas? I'm dreaming again and wishing for more torque in my SN95...

 

BlackPearl955.0

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Jun 8, 2007

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Blashyrkh, Wisconsin

May 12, 2008

#2

• May 12, 2008

• #2

I would like an answer to this as well as this will be my goal

 

Redsnk95

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Feb 3, 2002

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Houston, TX

May 12, 2008

#3

• May 12, 2008

• #3

If you are going to keep the boost low then I would opt for 9.5 or 10.0:1 compression if doing a custom piston.

 

95snoozer

Active Member

Dec 14, 2002

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RCR

May 12, 2008

#4

• May 12, 2008

• #4

what KB, remember the Kb uses a gt40 which will need to be heavily ported for yoru application.

You should go turbo for monster torque.

 

BlackVert

15 Year Member

Oct 3, 2003

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Bethesda, MD

May 12, 2008

#5

• May 12, 2008

• #5

probably something around 9.0:1 or so.

boost is much happier with low compression numbers.

 

BlueSaph95GT

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Sep 16, 2003

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Oak Lawn IL

May 12, 2008

#6

• May 12, 2008

• #6

http://store.summitracing.com/egnse...k+flow+piston&searchinresults=false&N=700+115

anyone have an idea of which of these pistons might create a 8.5:1 or 9.0:1 ratio??? 8.2 deck/347 with ported TW heads...

 

juiced_94gt

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Mar 30, 2005

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May 12, 2008

#7

• May 12, 2008

• #7

Im sorry to hijack but would a 331 with flat top CHP pistons and 61cc AFR 185's live under very low boost with a procharger (6lbs.)??? I really just want a slight bump in power and the WHISTLE I know I know I should have bought dished pistons but I didn't think of it till recently, and it will be custom tuned for sure.

 

DDSTANG94

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Dec 9, 2006

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FRASER, MICHIGAN

May 12, 2008

#8

• May 12, 2008

• #8

juiced_94gt said:

Im sorry to hijack but would a 331 with flat top CHP pistons and 61cc AFR 185's live under very low boost with a procharger (6lbs.)??? I really just want a slight bump in power and the WHISTLE I know I know I should have bought dished pistons but I didn't think of it till recently, and it will be custom tuned for sure.

Click to expand...

6 lbs isnt much, but isnt a "slight bump" neither..lol

 

BlackVert

15 Year Member

Oct 3, 2003

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Bethesda, MD

May 12, 2008

#9

• May 12, 2008

• #9

juiced, what is your compression ratio?

i am thinking about parchisi, who put a some low boost on his 408 that had 11:1 compression and he broke a piston.

feel like breaking a piston? i'd stay away from boost unless your compression ratio is under 9.5:1

 

parchisi

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Apr 13, 2006

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New Mexico

May 12, 2008

#10

• May 12, 2008

• #10

If you decide you want to do it just be really conservative with a higher compression ratio. I was only hitting about 8 lb of boost with my procharger.

And also I'm at 10:1, but its still on the high side.

 

BlackVert

15 Year Member

Oct 3, 2003

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Bethesda, MD

May 13, 2008

#11

• May 13, 2008

• #11

parchisi said:

... also I'm at 10:1, but its still on the high side.

Click to expand...

oops , sorry, i don't know why i thought it was 11:1