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Author
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Topic: A shrouded question?
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stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 03-05-2002 11:14 AM
   
I now have my Windsor JR heads, 58cc chambers and 1.94 intake valves. The casting in the combustion chamber is very rough, and I will be polishing them. However, even with the 1.94 intakes, they still seem too close to the combustion chamber wall. Is there a minimal clearance you guys like to see, or an optimal clearance? I can still deck the block or shave the heads to get my compression ratio.
Thanks,
Dave
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 03-05-2002 12:01 PM
All we ever do to them is clean the up a bit to make certain that they are all the same and then cc them to equal.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 03-05-2002 12:06 PM
Thanks, Alex.
Whats your error of margin on a mostly street car between smallest and largest?
Dave
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JCQuinn@work
Gearhead Posts: 935
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 03-05-2002 12:55 PM
The best way to determine how much you can clearance next to the intake valve is paint the deck of the head next to the intake with machinists dye and bolt the head onto a bare block. Don't torque it, you just need it snug. Turn the block over and use a scribe to mark where the edge of the cylinder is next to the valve. You don't want to grind beyond this mark or the cylinder will act as a flow disrupter. The flow is not distributed evenly around a valve head. The port shape determines the distribution to some extent but the bulk of the flow just takes the most direct path into the cylinder. This means that most of the flow is directed across the top of the valve away from the port. Engineers try to alter the flow path to promote the optimum amount of swirl for best combustion so the latest designs may deviate somewhat from this pattern but physics are going to send most of the charge in the easiest path, a straight line. John Quinn
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