How To Check PTV???????

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Nov 7, 2007 | 11:20 AM

#21

Xtnct00WS6

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From: Sterling VA

This is how I checked PTV clearance:
https://ls1tech.com/forums/showpost....64&postcount=6

Nov 7, 2007 | 11:21 AM

#22

brad8266

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From: Watertown, NY

Its going to be a very tight fit in there, especially if the pistons have no valve relief in them or the valves are not sunk into the heads at all.

Nov 7, 2007 | 11:23 AM

#23

brad8266

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From: Watertown, NY

Quote:

Originally Posted by Xtnct00WS6

This is how I checked PTV clearance:
https://ls1tech.com/forums/showpost....64&postcount=6

Thats all fine and dandy if you already have the $100+ degree wheel or plan on buying one anyway.

Nov 7, 2007 | 01:38 PM

#24

Xtnct00WS6

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From: Sterling VA

Quote:

Originally Posted by brad8266

Thats all fine and dandy if you already have the $100+ degree wheel or plan on buying one anyway.

The whole degree kit is under 140. Since the least amount of clearance isn't at TDC (I think it's a few degrees after), it's best to get a degree wheel and do it right.

Nov 7, 2007 | 04:23 PM

#25

brad8266

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From: Watertown, NY

Quote:

Originally Posted by Xtnct00WS6

The whole degree kit is under 140. Since the least amount of clearance isn't at TDC (I think it's a few degrees after), it's best to get a degree wheel and do it right.

You will get the same result regardless of what method you use. The least clearance will be at within a few degrees either way of TDC and is measured either of the 3 ways. Using a degree wheel is no more accurate than the others.

Nov 7, 2007 | 04:28 PM

#26

vettenuts

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From: Little Rhody

Just mark your pulley with a protractor and make a pointer from a bent coat hanger or something.

Nov 7, 2007 | 07:55 PM

#27

Xtnct00WS6

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From: Sterling VA

Quote:

Originally Posted by Ryan02SS

Rig the valves with light checking springs, and then installing the head and valvetrain with a dial indicator reading off the retainer. Start at 20 degrees BTDC, set the indicator to zero, and then work the exhaust rocker by hand until the valve hits the piston, and read the indicator travel. Repeatedly adjust the crank position 2 degrees forward, re-zero the indicator, and check again. The reading will diminish to the minimum V-to-P value, and then open up again. Next, perform the same procedure on the intake valve, moving from TDC to about 20 degrees after.

This is the most precise way and you need a degree wheel and dial indicator.

I've been told by a few sponsors that this is the most accurate way to check also.