Thread: BB Hyd Roller

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Has anyone used Comp Cams 280HR Hyd roller cam?

I'm primarily interested in vac at idle.

All help will be appreciated.

Roller cams seem to do the best with vac at idle compared to a hydraulic or worse yet , the solid lifters.
I have no exsperiance with that cam.

Originally Posted by Geezer2

Has anyone used Comp Cams 280HR Hyd roller cam?

I'm primarily interested in vac at idle.

All help will be appreciated.

i do not use much comp cam s stuff but used other cam grinders for street hyd rollers for bbc like . crane .crower. howards. erson . if you have the lift and and the @050 dur with lc i can tell you if it is close to any thing i have used

224/224 @ .050 with .566/.566 lift. Not radical. I might use a 236/236 with .578/.578

Just concerned about vac.

Any help accepted.

i used a intake 222@050 lift 569 and ex 230 @050 lift590 the lc was 112 that was not to bad on vac and 567/577 214/222 lc112 that did a good job with vac and some 483lift 224 115 gm take outs that should work good and alot bigger stuff that would not make much vac

Both of the cams I'm looking at are on a 110 CL with 4 degrees adv (intake on 106).

Just want to make sure I have vac for PB, A/C, etc

Originally Posted by Geezer2

224/224 @ .050 with .566/.566 lift. Not radical. I might use a 236/236 with .578/.578

Just concerned about vac.

Any help accepted.

I'm running a hyd. roller 236/236 @ .050 with a 110 LSA which has a lift of 626 across the board and I have VERY little vac. I had to go to hyd race style brakes because there was not enough vac. for a brake booster. I would have had only enough vac. for one push of the brake pedal and after that I would have been dragging my feet to stop Fred Flintstone style!

I'm running a 454 BBC in a 30 Model A roadster which has the NEW style Vintage Super Cooler AC that does not run off of vac. so I have no issues there due to very low vac. Originally I thought I would have enough vac. for brakes which is WHY I never went larger on the 236/236 hyd roller. Now since I'm using race style brakes I wish I would have went up larger on the hyd roller cam.

don't know about the AC vac requirements but you could add a vac canister/reservoir that should be effective for your power brakes... have your cake and eat it?

Just a thought...

-Chris

Vac can is good idea, BUT, the engine is in my Seville and there's not enough room for a memory under the hood.

Originally Posted by skids72

don't know about the AC vac requirements but you could add a vac canister/reservoir that should be effective for your power brakes... have your cake and eat it?

Just a thought...

-Chris

run the cam you want worry about vac later if to low just buy the vac pump you can put that any were or the can there lots of room in there you want to talk no room i stuff a 454 in a anglia that was no room you can put the vac pump in the trunk

you should be fine.
I can't remember the comp number of my cam , but the specs are almost the same as yours (just nore duration a more lift...but barely) And I have all my vacuum power needed. let me dig out my cam card to give you exact specs....lol. I have no memory anymore and I am not even 30 yet...lol

I recently talked to an engine builder who built a 496 mudd-bogg engine, 14:1 compression, he used a comp cams 236/242 .612/.612 @112 lsa, it has only 15 deg overlap. He got 21 inch vacuum. He uses total seal rings, said that adds 1-2 in Hg, bleed down hydraulic roller lifters add another 1-2 (similar to rhoads lifters). He told me this cam will make around 16-inch vacuum on my street 540. His engine made 625 horse.