Isky cam specs

Found the specs to the old cam I had in the "open" class engine. Ran good, sounded great.



It was spec'd and ordered by someone other than me. I called Isky with the number and they gave me all the other information

45 motor, nothing major not enough cubes for todays world. Pankey ended up with it

Mitch, I just put out there since I found it and didn't go looking for the other post.  This is the cam you said that you didn't have anymore

You didn't take a degree wheel and actually measure the cam out with a degree wheel did you Larry?

That answers a lot. If you were to call isky and send them a cam you would not get anything like that grind for a flat plane, 180* Siamese port engine like this. Somewhere there's a mis communication and error. Wrong specs were given

No offense to you Larry, but prank should know better.....of course he will lie through his teeth also and purposefully give bad information. We've seen it many times on here.

The way these engines are configured limit the available time we have available for the induction events. An engine with individual ports can tolerate more duration. A 6 cyl Siamese port can tolerate more duration. But a 180* or flat plane crank simply can't. You see there is overlap of the intake and exhaust valves, then there is overlap of both intake valves on a port at the same time that one exhaust valve is open......you wind up with 3 valves open on 2 cylinders opened together. In a sense, to much duration will "airlock" the engine to where it's not going to run well at all.

If you were to call any reputable can grinder or designer, you will get the same story.

The way these engines are configured with the flat plane 180* offset crank and the Siamese port it is hard to run much duration. If it had individual ports, you could. If it were a 6 cyl inline you can run more. But anything much more than the mid 220's @ .050" isn't going to work.


Edited by wi50 - 04 May 2015 at 3:55pm

Yep Pankey told you that you were doing way to much port work on the exhaust side if you remember of coarse a search would show it if you forgotten any Pankey says you learn from him fairly quick though

WI...no offense taken. I knew nothing about what I jumped in to with both feet and had a hard learning curve.

mgburchard wrote: Blue you will just have to petition forum to let him back on to get his experience and knowledge

ohh okay makes more sense, here i was trying to revert back to my 1st grade self to understand that but since there are others here that can use punctuation and are efficient in grammar i dont have to anymore.

Larry the one Pankey spec for my 452 inch allis is 356 duration at .006 lift with ivo at 61.2 degrees btdc and ivc 115 degrees abdc

Seams to me he knows more about cams than you do. Larry post a spec of a different manufacturer than berry and its what Pankey said it was in the 175 cam spec topic .how long ago is that topic been seams you would have learned a little more by now on how all the shelve grinds are 244 duration at 50

Sure Its a Pankey and Iskyderian project .Pankeys number is 423- two42eightfive96 or the number you have for Ron Iskyderian

Lol that's funny butch . I knew you didn't know anything about engines . a 4 cycle single cylinder engine has 720 degrees of rotation to complete a cycle

Blue no one said 452 inch single cylinder . I said a Cingle cylinder four cycle engine has 720 degrees and Pankey had me post those specs cause Marty said advertised duration back in the 175 spec forum was seat to seat as you can see at .006 lifter rise it's 354 duration seat to seat duration for any cam would be 360 degrees but its figured at a lifter rise not seat to seat

mgburchard wrote: Blue no one said 452 inch single cylinder . I said a Cingle cylinder four cycle engine has 720 degrees and Pankey had me post those specs cause Marty said advertised duration back in the 175 spec forum was seat to seat as you can see at .006 lifter rise it's 354 duration seat to seat duration for any cam would be 360 degrees but its figured at a lifter rise not seat to seat