L98 Cam Question
Thread Starter
Instructor
Joined: Apr 2005
Posts: 141
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From: Downers Grove IL
L98 Cam Question
I have a 1991 L98. The car has an aftermarket cam of unknown make or model. How do I figure out what the cam is without rebuilding the whole engine and make sure that it is degreed correctly?
The lowest the engine idles is 950 rpm with timing advanced to between 8 to 10 degrees. Vacum is very limited and can not support the power brakes. The car has 125k, seams to have good compression and starts, even after siting with a short turn of the key. I do not think the engine is orginal to the car. Under acceleration the engine is a little hesitant until 3,000 rpm, then screams to 5,500. You have to prep for the shift as it at 5,500+ that quick.
Help or insite is much appreciated, thanks Polo.
The lowest the engine idles is 950 rpm with timing advanced to between 8 to 10 degrees. Vacum is very limited and can not support the power brakes. The car has 125k, seams to have good compression and starts, even after siting with a short turn of the key. I do not think the engine is orginal to the car. Under acceleration the engine is a little hesitant until 3,000 rpm, then screams to 5,500. You have to prep for the shift as it at 5,500+ that quick.
Help or insite is much appreciated, thanks Polo.
Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
I have a 1991 L98. The car has an aftermarket cam of unknown make or model. How do I figure out what the cam is without rebuilding the whole engine and make sure that it is degreed correctly?
The lowest the engine idles is 950 rpm with timing advanced to between 8 to 10 degrees. Vacum is very limited and can not support the power brakes. The car has 125k, seams to have good compression and starts, even after siting with a short turn of the key. I do not think the engine is orginal to the car. Under acceleration the engine is a little hesitant until 3,000 rpm, then screams to 5,500. You have to prep for the shift as it at 5,500+ that quick.
Help or insite is much appreciated, thanks Polo.
The lowest the engine idles is 950 rpm with timing advanced to between 8 to 10 degrees. Vacum is very limited and can not support the power brakes. The car has 125k, seams to have good compression and starts, even after siting with a short turn of the key. I do not think the engine is orginal to the car. Under acceleration the engine is a little hesitant until 3,000 rpm, then screams to 5,500. You have to prep for the shift as it at 5,500+ that quick.
Help or insite is much appreciated, thanks Polo.
Thread Starter
Instructor
Joined: Apr 2005
Posts: 141
Likes: 0
From: Downers Grove IL
CrusinartVette, Thanks I have heard that that is the case but never looked when installing one (or it has been that long ago that I forgot). That is easier than removing the cam to get the numbers and after the many miles the timing chain cover is leaking oil and the seal has to be replaced. Hopefully I can do both while fixing the leak.
pmihaltian, This is what makes me feel like the engine is not orginal, no stampings on the passager side front deck. But I may not have had enough of the accessories off the engine to actually see that.
Thanks, Polo
pmihaltian, This is what makes me feel like the engine is not orginal, no stampings on the passager side front deck. But I may not have had enough of the accessories off the engine to actually see that.
Thanks, Polo
Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
Here is a photo of what the pad should look like. Also, there are engine numbers on the driver's side read block (see below)
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
To find out what cam is in it youll still have to tear down the front of it.
You can get a head casting # by removing the valve cover it will be stamped somewhere on the surface of the head amongst the valvesprings, thats a start.
You can get a head casting # by removing the valve cover it will be stamped somewhere on the surface of the head amongst the valvesprings, thats a start.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
You can use a degree wheel and dial indicator and get the specifications on the cam while it is installed in the car. That is what you really need to know to determine if it is the correct cam for the application. Check the intake and exhaust numbers on cylinder #1 and you have all the information you need.
