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Author Topic:   A shrouded question?
stang106
Gearhead

Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-05-2002 11:14 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
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

posted 03-05-2002 12:01 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
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.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

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NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
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stang106
Gearhead

Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-05-2002 12:06 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Thanks, Alex.
Whats your error of margin on a mostly street car between smallest and largest?
Dave

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[email protected]
Gearhead

Posts: 935
From: Lakewood, CO, USA
Registered: Jun 2001

posted 03-05-2002 12:55 PM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
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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