Compression Test - Page 4 - ZR-1 Net Registry Forums

Ccmano · 02-22-2018

Quote:

Originally Posted by Vette73

I think the ZR-1,has to be,one car that many people who have owned in the past,did not drive very much...

Many many examples of low mileage cars out there...

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Yes, back in the day many thought they would make killing if they kept it with low or no miles for 20 or so years. Lol... so much for that.
H

KILLSHOTS · 02-22-2018

Quote:

Originally Posted by Ccmano

Funny, I just looked in the FSM. Typical factory speak. They claim 150-200 psi with a 15% Cylinder to Cylinder variation tolerance. I suppose that gave them warranty leeway.
H

OK cool, based on that, I guess the peak numbers are OK and variation is less than 3%. Thanks.

DRM500RUBYZR-1 · 02-22-2018

Quote:

Originally Posted by KILLSHOTS

OK cool, based on that, I guess the peak numbers are OK and variation is less than 3%. Thanks.

I cannot imagine ANY reason to not buy that car.
I am shocked that it is even still around.
Go ahead with your purchase, but best to wear a mask and carry a gun, because your will surely be stealing it!!!
That will be a well-bought car!
Marty

LGAFF · 02-22-2018

I spoke to Scott skinner once about compression testing. He told me new motors were all over the place 150s and some as high as 300 but stabilized after use

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KILLSHOTS · 02-26-2018

Hey guys, as many of you know, this car would only run for 5 to 10 seconds and it was determined that it was a fuel pump issue, which was fixed. One of my biggest concerns was the extent of the "out of storage" fuel system service that the car received a couple years back. I knew it had new injectors but was concerned there would be a nightmare inside the fuel tank. However, I just received this pic of the sending unit that just came out and the one that replaced it. Since the one that came out looks brand new, I'm feeling better about moving forward now...

phrogs · 02-27-2018

That's quite the spread in the FSM but thats the bible. I'm always more concerned with numbers being pretty consistently even across the board.

There's always room for some difference some cylinders wear faster than others too. Use the 15% difference as the guide and don't focus solely on the numbers as many do.

As for the fuel pump I want to say that means the primary pump was dead. Not rare at all.

02-22-2018	#34
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Compression Test I spoke to Scott skinner once about compression testing. He told me new motors were all over the place 150s and some as high as 300 but stabilized after use Sent from my iPhone using ZR-1 Net Registry __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

02-27-2018	#36
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,753	Re: Compression Test That's quite the spread in the FSM but thats the bible. I'm always more concerned with numbers being pretty consistently even across the board. There's always room for some difference some cylinders wear faster than others too. Use the 15% difference as the guide and don't focus solely on the numbers as many do. As for the fuel pump I want to say that means the primary pump was dead. Not rare at all. __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything. Last edited by phrogs; 02-27-2018 at 04:57 PM.