598 bbc 13.1 compression on the street - Chevelle Tech
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  #1  
Old Jun 26th, 13, 10:05 AM
Bw496 Bw496 is offline
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Talking 598 bbc 13.1 compression on the street

Hey guys I just stumbled across a smoking good deal on a 598 big block chevy has dart big m block forged bottom end brodix 2plus cnc ported heads solid roller cam 800-748 lift Jessel rockers 1050 dominator brand new thinking about dropping in my mini tubbed 68 camaro but not sure how the compression will be on the street motor makes 1043 hp at crank only gonna run 32 degrees timing and run it rich will pump gas mix with race gas work?
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1972 chevy nova ss (PRO STREET) back half 4 link w/coil overs Dana 60 4:56 gears aero motive fuel system th400 w/4500 ptc converter transbrake fresh 496 bbc 38cc domed forged pistons scat 4340 crank scat h beam rods solid roller camshaft 1050 dominator team g intake new brodix 2plus cnc ported heads aluminum radiator (all throttle no bottle lol)
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  #2  
Old Jun 26th, 13, 10:16 AM
Bikerman9967 Bikerman9967 is offline
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Default Re: 598 bbc 13.1 compression on the street

do you know how much pressure is running in the cylinders?
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  #3  
Old Jun 26th, 13, 10:21 AM
crazydavey crazydavey is offline
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Default Re: 598 bbc 13.1 compression on the street

Brian personally I wouldn't try to run a blend like that with 13 to 1.... the cheapest race gas is usually a 110, probably $8-$9/gal in most places around here. If you have E85 where you are that would be the cheapest pump fuel to run with that much compression. You just need a E85 prep'd carb to do that...
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  #4  
Old Jun 26th, 13, 10:33 AM
Harold Sutton Harold Sutton is offline
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Default Re: 598 bbc 13.1 compression on the street

Change the pistons or forget the street, it isn't going to work, ask Del. E-85 from the pump is very inconsistant in quality and is a death sentence for a high compression engine. I doubt the engine makes over 750 h.p. with those heads, someone is blowing smoke you know where.
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  #5  
Old Jun 26th, 13, 11:51 AM
dell72 dell72 is offline
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Default Re: 598 bbc 13.1 compression on the street

I'm in a similar position. I found a 13:1 BBC shortblock , do I try running it as is or change/ modify the pistons.
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  #6  
Old Jun 26th, 13, 11:57 AM
Offroadr Offroadr is offline
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Default Re: 598 bbc 13.1 compression on the street

Quote:
Originally Posted by crazydavey View Post
Brian personally I wouldn't try to run a blend like that with 13 to 1.... the cheapest race gas is usually a 110, probably $8-$9/gal in most places around here. If you have E85 where you are that would be the cheapest pump fuel to run with that much compression. You just need a E85 prep'd carb to do that...
I agree, I used to run a 13.5-1 BBC on the street and what a PITA. I now have a pump gas motor thats alot easier to deal with. Getting race gas is a real hassle, where I live you have to pump it into a can and not a car.
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  #7  
Old Jun 26th, 13, 1:16 PM
Blownchevelle68 Blownchevelle68 is offline
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Default Re: 598 bbc 13.1 compression on the street

More hassle than enjoyment I'm afraid, at least for a street car.
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  #8  
Old Jun 26th, 13, 3:36 PM
Bw496 Bw496 is offline
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Default Re: 598 bbc 13.1 compression on the street

That's what puzzles me I was right at 13.1 comp in my 496 38cc pistons and heads milled to 112 and I would mix 112 octane with 93 and drove it everywhere never heard any pinging or clatter just didn't know if this big of a motor would do it I already bought the engine have all the paperwork for it everything is brand new it's a shaffiroff short block dude just added heads and intake
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1972 chevy nova ss (PRO STREET) back half 4 link w/coil overs Dana 60 4:56 gears aero motive fuel system th400 w/4500 ptc converter transbrake fresh 496 bbc 38cc domed forged pistons scat 4340 crank scat h beam rods solid roller camshaft 1050 dominator team g intake new brodix 2plus cnc ported heads aluminum radiator (all throttle no bottle lol)
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  #9  
Old Jun 26th, 13, 3:54 PM
dell72 dell72 is offline
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Default Re: 598 bbc 13.1 compression on the street

So here's a question for the pro's that I'm sure everyone has pondered at one time. What is the Max safe cranking compression and compression ratio that can be run on 93 octane. I've heard of big BBC engines run high compression on pump gas due to cylinder pressure being bled off by big cams. Is there any truth to this or racers tales.
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  #10  
Old Jun 26th, 13, 3:56 PM
jackie schmidt jackie schmidt is offline
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Default Re: 598 bbc 13.1 compression on the street

I agree, those heads by Brodix's own numbers only low about 320 cfm. With those heads, that many inches will be done at about 5800@ rpm.

If you were happy with your 496 at that compression, you will probably be happy with the big inch engine as well. But that being said, 95 percentent of the world thinks that much compression on the street is unjust asking for problems.
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  #11  
Old Jun 26th, 13, 5:14 PM
modchevelle modchevelle is offline
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Default Re: 598 bbc 13.1 compression on the street

Too much compression and what is the cam duration? A piston change for sure and cam change maybe? Is it worth it??
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  #12  
Old Jun 26th, 13, 5:20 PM
jughead_141 jughead_141 is offline
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Default Re: 598 bbc 13.1 compression on the street

Quote:
Originally Posted by jackie schmidt View Post
I agree, those heads by Brodix's own numbers only low about 320 cfm. With those heads, that many inches will be done at about 5800@ rpm.

If you were happy with your 496 at that compression, you will probably be happy with the big inch engine as well. But that being said, 95 percentent of the world thinks that much compression on the street is unjust asking for problems.
Only if they are stock. My buddy has them (ported) on his 582 and is about 980HP/880TQ at 14:1 on alcohol.
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  #13  
Old Jun 26th, 13, 6:58 PM
novaderrik novaderrik is offline
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Default Re: 598 bbc 13.1 compression on the street

if it's available, i'd run E85 in it and see what happens... you can get cheap testers that tell you how much alcohol is in any given batch of fuel- it's just a test tube with marks on it that you fill to a line, add water to another line, and shake. then you look at how it all separates out using another set of lines.. then you can pull the timing back a few degrees or whatever if you get less than the ideal amount of ethanol..
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  #14  
Old Jun 26th, 13, 10:43 PM
Bw496 Bw496 is offline
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Default Re: 598 bbc 13.1 compression on the street

These heads are hogged out pretty good the were on a 588 before and the intake is port matched to them I look at the brodix 2plus cnc heads on my 496 and these look totally different in the runners
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1972 chevy nova ss (PRO STREET) back half 4 link w/coil overs Dana 60 4:56 gears aero motive fuel system th400 w/4500 ptc converter transbrake fresh 496 bbc 38cc domed forged pistons scat 4340 crank scat h beam rods solid roller camshaft 1050 dominator team g intake new brodix 2plus cnc ported heads aluminum radiator (all throttle no bottle lol)
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  #15  
Old Jun 26th, 13, 10:47 PM
jmarkaudio jmarkaudio is offline
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Default Re: 598 bbc 13.1 compression on the street

Looks like plenty of E85 in and around the Austin area. About $3 a gallon for race fuel is a plus...
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