practical camshaft question

Belgian1979vette

Belgian1979vette

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Location
Koersel/Belgium
I have someone recommending an inverted roller cam profile with 245-249° at .050, .600 lift and LSA 108.

Anyone have any experience with a cam like that and rpm range ?
 
For my opinion is a bad idea...... in all the SBC 23° heads it is impossible to have a better efficiency in the exhaust than in the intake.

This cam I think have too much exhaust time even for a turbo engine!
 
That's why the exhaust duration is commonly longer, because of the port. What's it for? a 427, 434...something along those lines?
 
Twin_Turbo said:
That's why the exhaust duration is commonly longer, because of the port. What's it for? a 427, 434...something along those lines?
Click to expand...

Nope for the combo i'm trying to get together after my mayor problem. 4.125 X 3.250 / 6.250 on fi itb's.

Cam was suggested by Mike Jones. He's supposed to be the cam man at the moment in the states. www.jonescams.com
From conversation i've seen from him at another forum, he seems very very knowledgable.
The guy basically bases his recommendation on the intake, head, bore, stroke and what not.

I told him it was for weekend street use.
 
Similar combo but on 15° heads and alcohol.

[ame]http://www.youtube.com/watch?v=hBSpKCns1fo[/ame]

Decided on an engine block today. It's going to be a bowtie 184 block.
 
Only diff is 12 degree flows a ton more than 23 degree, are you going to spin high rpm?

Sent from my GT-I9000 using Tapatalk
 
Twin_Turbo said:
Only diff is 12 degree flows a ton more than 23 degree, are you going to spin high rpm?

Sent from my GT-I9000 using Tapatalk
Click to expand...

I've got a 4.11 & M22 so it will be at the beginning of the power band.
Max. torque is at around 5000 with it, flat curve. Top hp at 7200.
Jones said shorter cam wouldn't do much for lower rpm torque, so rear gear has to compensate a little here.

I would be glad to get around 450-500 hp. around some number torque.

Yep, the 15 flows more, like 25-30%. I would think it would be safe to assume i loose a similar amount. Still very much acceptable imo.
 
Last edited:
I would want to know what the exact combination is. Stock block or aftermarket? What heads and intake. Mike has a long winning history under his belt and he definately knows the math behind camshaft application. I know the cam sounds big, but on a 108 LSA it will come on faster and will be a narrower but higher peak power curve. Type of cam solid/hydraulic and flat tappet or roller?
 
550TD said:
I would want to know what the exact combination is. Stock block or aftermarket? What heads and intake. Mike has a long winning history under his belt and he definately knows the math behind camshaft application. I know the cam sounds big, but on a 108 LSA it will come on faster and will be a narrower but higher peak power curve. Type of cam solid/hydraulic and flat tappet or roller?
Click to expand...

Mech. roller.

Bowtie, siamesed bore block, 4.125 X 3.250 X 6.250. ITB FI induction, shaft rockers in the future, Alu dart pro 1 215's
 
I have a hyd roller jones cam in my BB. 280/292 224/234 at .050. 569/569 lift. Static Comp. Ratio 10.7.1.

Lotsa power yet good street manners.

Jones knows his stuff.
 
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