So my hawk has been sitting motionless since Sept 1999. 60k miles on the block. Always changed the oil at 3000, full synthetic. I must get the hawk back on the road by September and I've been researching cylinder head/cam combo's. I haven't seen what the cylinder heads and rings look like yet. I have everything but the heads off.

Getting to the point, Jason Short is selling a set of worked LE2 heads with a 53cc chamber volume. Not sure if these heads are gonna turn my block into a flower pot or not and need some advise and direction.

Is the CR with the 0.026 gaskets are a bit much for 93 octane on a stock block? Here are the numbers I've crunched:

Engine Bore (in.) 4.000
Engine Stroke (in.) 3.480
Deck Height (in.) 0.025
Gasket Thickness (in.) 0.026
Cyl Head (cc) 58
Piston valve reliefs (cc) 5

CR = 11.45

Or with stock head gaskets

Engine Bore (in.) 4.000
Engine Stroke (in.) 3.480
Deck Height (in.) 0.025
Gasket Thickness (in.) 0.049
Cyl Head (cc) 53
Piston valve reliefs (cc) 5

CR = 10.76

Thoughts? Cam combo? Thanx

 

Depends on the camshaft. Static compression ratio alone does not dictate what type of fuel is required. You need to find out your dynamic compression ratio which incorporates cam timing events (specifically how many degrees past ABDC the intake valve closes).

And just to correct your info, stock piston valve reliefs are 5cc, not 2.

 

Thanx for the correction. Also I might have calculated wrong. To calculate CR I used this calculator: http://www.csgnetwork.com/compcalc.html

Should the value be -5 in the Piston Dome Volume?

I figured static compression isn't the only factor that's why I'm looking for advise. If I did the calcs right this time the CR looks a little more believable.

 

I've always used this calculator because it is less confusing than all the rest:

http://www.turbofast.com.au/Tfcomp.html

What cam were you planning on running?

 

Loyd Elliot recommended this cam for since it's a stock bottom end: 226/230 .565/.565 111 LSA. - 1900-6200 RPM

This of course is with my headers, 58mm throttle body, T56, 3.42 gears, 30# injectors, etc.

Of course I'm always open to suggestions.

 

You'll be fine with the .026" gaskets and that particular cam. Just make sure you get a good tune to go along with it. Should be a stout performer when all is said and done.

 

Thanx. I'm hoping the rings aren't an issue for sitting so long.