Minimum clearance between camshaft and piston (bolts)?
If you have clearance problems why would you buy a cam of 1.050? When they will sell you a .900 base circle
Thread Starter
Drifting
Joined: Aug 2004
Posts: 1,677
Likes: 1
From: Potomac Falls VA
Melting Slicks
Joined: Nov 2003
Posts: 2,362
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From: San Antonio TX
Yes tell the Cam Company you are building an engine with a larger stroke crank and they should send you a small base circle cam just for the task at hand. So yes a small base circle cam is the way to go. You are lucky that they now have such things lol.
Sorry I do wish that I noticed this thread sooner. But to build an engine with a larger stroke crank takes time to do it right. I have built many VW Air Cooled stroker engines with excess of 1/2 stroke over stock and I will say that it is very time consuming to do so correctly. The only V 8 I have worked on was a 708CI Big Block Chevy. But that was all Custom stuff. I think the bottom end of that engine was together and apart more than a dozen times lol.
Sorry I do wish that I noticed this thread sooner. But to build an engine with a larger stroke crank takes time to do it right. I have built many VW Air Cooled stroker engines with excess of 1/2 stroke over stock and I will say that it is very time consuming to do so correctly. The only V 8 I have worked on was a 708CI Big Block Chevy. But that was all Custom stuff. I think the bottom end of that engine was together and apart more than a dozen times lol.
Thread Starter
Drifting
Joined: Aug 2004
Posts: 1,677
Likes: 1
From: Potomac Falls VA
Yes tell the Cam Company you are building an engine with a larger stroke crank and they should send you a small base circle cam just for the task at hand. So yes a small base circle cam is the way to go. You are lucky that they now have such things lol.
Sorry I do wish that I noticed this thread sooner. But to build an engine with a larger stroke crank takes time to do it right. I have built many VW Air Cooled stroker engines with excess of 1/2 stroke over stock and I will say that it is very time consuming to do so correctly. The only V 8 I have worked on was a 708CI Big Block Chevy. But that was all Custom stuff. I think the bottom end of that engine was together and apart more than a dozen times lol.
Sorry I do wish that I noticed this thread sooner. But to build an engine with a larger stroke crank takes time to do it right. I have built many VW Air Cooled stroker engines with excess of 1/2 stroke over stock and I will say that it is very time consuming to do so correctly. The only V 8 I have worked on was a 708CI Big Block Chevy. But that was all Custom stuff. I think the bottom end of that engine was together and apart more than a dozen times lol.
Melting Slicks
Joined: Nov 2003
Posts: 2,362
Likes: 1
From: San Antonio TX
Shane just figure what base circle or size of the cam you have now and how much room you have. From there you can figure out how much smaller you need your new cam to be.
You might look into a book called how to hot rod the VW Type 1. As from what I do remember it did show the steps needed for a larger stroke crank. I know it is not the same as a V8 but the info is still the same.
You might look into a book called how to hot rod the VW Type 1. As from what I do remember it did show the steps needed for a larger stroke crank. I know it is not the same as a V8 but the info is still the same.
Last edited by SHAKERATTLEROLL; Mar 21, 2010 at 04:27 PM.
Drifting
Joined: Dec 2005
Posts: 1,360
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From: NORTHEAST
Don't know what you are using for rods and how they have been clearanced, but on the 383 strokers we have built we have used a stroker rod and on standard flat tappet cams both HYD and solid the base circles should be 1.190 and we have always used a base circle of 1.130 on our builds with the stroker rods.
Most solid rollers will be 1.060 base circle.
The bigger the base circle the better as roller lifters love bigger base circle cams.
On our builds with 3.875 strokers we have been using a .930 base circle solid roller cam
Most solid rollers will be 1.060 base circle.
The bigger the base circle the better as roller lifters love bigger base circle cams.
On our builds with 3.875 strokers we have been using a .930 base circle solid roller cam
Thread Starter
Drifting
Joined: Aug 2004
Posts: 1,677
Likes: 1
From: Potomac Falls VA
I just measured the 12-433-8 cam which has the clearance issues and using my calipers, it looks like the base circle is about 1.14" which I am going to try and confirm with Comp Cams tomorrow.
Assuming this is reasonably accurate, should I go to a 1" or even .9" base circle with the HYD rollers? Or is .9 too little base circle for this set-up?
Shane
Assuming this is reasonably accurate, should I go to a 1" or even .9" base circle with the HYD rollers? Or is .9 too little base circle for this set-up?
Shane
