Plastigage

89LXNB · 01-04-2001, 11:12 AM

Is the use of plastigage mandatory when assembling a motor. If the crankshaft moves about freely, should you still use plastigage anyways?
Just wondering.

01-04-2001, 11:43 AM

It isn't mandatory, but it is a safe-guard to prevent firing up a motor that has been poorly machined or cast. I would say do anything you can to make sure it is perfect. An engine builder that I know doesn't use it, but he blueprints every engine.

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88GT stock shortblock, ported GT-40 iron heads, ported Edlebrock Performer intake, 24# inj, Pro-M 75mm Bullet MAM, 3.73, hurst short throw, F-303, electric fan, alum rad, FMS HD clutch, R134a ac conversion, 70mm TB , and some other stuff I probably forgot, best run so far on ET streets is 13.02@106 with a 1.87 60ft.

moosejaw · 01-05-2001, 01:34 AM

In your case it would be a safe guard against a "too loose" fit which could result in oiling problems (low pressure).

Like above it is not necessary on a blueprint unless you suspect something is not right (misslabelled bearing etc).

Mike

Rick 91GT · 01-05-2001, 02:04 PM

For the couple dollars it cost it is very helpful.

01-04-2001, 11:12 AM	#1
89LXNB Registered Member Join Date: Jul 2000 Location: San Jose CA Posts: 149	Plastigage Is the use of plastigage mandatory when assembling a motor. If the crankshaft moves about freely, should you still use plastigage anyways? Just wondering.

01-04-2001, 11:43 AM	#2
88GT5.013.02 Guest Posts: n/a	It isn't mandatory, but it is a safe-guard to prevent firing up a motor that has been poorly machined or cast. I would say do anything you can to make sure it is perfect. An engine builder that I know doesn't use it, but he blueprints every engine. ------------------ 88GT stock shortblock, ported GT-40 iron heads, ported Edlebrock Performer intake, 24# inj, Pro-M 75mm Bullet MAM, 3.73, hurst short throw, F-303, electric fan, alum rad, FMS HD clutch, R134a ac conversion, 70mm TB , and some other stuff I probably forgot, best run so far on ET streets is 13.02@106 with a 1.87 60ft.

01-05-2001, 01:34 AM	#3
moosejaw Registered Member Join Date: Apr 1999 Location: St.Louis,MO Posts: 274	In your case it would be a safe guard against a "too loose" fit which could result in oiling problems (low pressure). Like above it is not necessary on a blueprint unless you suspect something is not right (misslabelled bearing etc). Mike

01-05-2001, 02:04 PM	#4
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	For the couple dollars it cost it is very helpful.