Clifford 272H cam in a turbo application?

[Anlushac11]

Couple of months back I bought a used Clifford 272dur and .450" lift from Mustang Geezer.

Anyone know how this would work on a turbo application? I cant find the cam specs on Cliffords site anymore so I do not know what the lobe centers are.

I also have MG's ported and polished 66ish log head with port divider.

Any help appreciated and thanks in advance.

 

[wallaka]

It would be pretty dang big I'd think.

 

[StrangeRanger]

I couldn't find any LCA or overlap data either. Jack didn't feel the need to publish it and Larry can't spell LCA.

My best guess is that it's too big a cam for a turbo app. High duration cams typically allow way too much blow thru and reduce the turbo's ability to build pressure. Look as Isky's turbo-specific cams for comparison. See pages 126 and 130 http://www.iskycams.com/onlinecatalog.html

They feature somewhat less intake lift, substantially less exhaust lift, low intake duration, essentially stock exhaust duration and a very wide LCA. They're designed for low boost pressures; larger pressures would probably require a bit more cam but it's unlikely they would require a lot more. You can obviously turbocharge with a hotter cam, but the farther from those sorts of figures, the fewer gains you're likely to see.

 

[Anonymous]

You can set the cam up in a block with a degree wheel and a dial indicator and get all the info you need.

A cam needs to be matched with head flow.

A too large cam in a too small head (or vice-versa) won't perform as well as a better matched cam/head.

 

[AzCoupe]

Clifford 272H specs are:

272/272 - 214/214 - .449/.449 - 110* - 2200-5000

 

[Anonymous]

Clifford 272H specs are:

272/272 - 214/214 - .449/.449 - 110* - 2200-5000

I think it would work well.

 

[StrangeRanger]

214° on a 110° has a lot of overlap. Doesn't that conflict with the turbo's ability to build boost? I should think that something on the order of 206-208° on a 112-114° would be much more suitable.

 

[wallaka]

That's what I was thinkin.

 

[Anonymous]

It depends a lot on the head flow characteristics. There are some guys making crazy power with cams that most people would think have no business being in a turbo engine. If you got it for a good price it might be worth it to just try it and see. The engine will make boost regardless.

 

[Does10s]

I'm with Linc's on this.

The cam in Kelly's Falcon is the FSPP 274S which is 224 degrees @ .050 with a 110 lobe center.
It seems to work pretty good I think!

The cam we put in Mike's EFI'd, turbo'd, '69 Sportroof is a 292 with .528" lift and 112 lobe center. Of course we haven't started it yet so I can't really comment on how it runs.

Later,
Will

 

[Mustang Boy]

well i say START IT START IT(i rant over and over again)

 

[hasa68mustang]

well i say START IT START IT(i rant over and over again)

AND GET A VIDEO OF IT!!! AND DO A BIG BURNOUT!!!!

 

[XFlow_Fairlane]

I know the 2.3L ohc guys have a pretty poor flowing head (albeit better than ours) and they will run as high as a 112 or 114 overlap. don't forget though that increasing the rocker ratio will increase this as most cam specs are given for stock rockers.

 

[StrangeRanger]

I know the 2.3L ohc guys have a pretty poor flowing head (albeit better than ours) and they will run as high as a 112 or 114 overlap.

That cannot be an overlap number; most likely you are looking at the lobe centers.

Typical overlaps for 300 camshafts (the only data i have real handy, 200-250 cams should be similar):

Isky turbo cam: (262-250°/208-194°/114°) = 28° overlap
Isky 256 (256°/206°/112°) = 32° overlap
Isky 280 (280°/224°/109°) = 62° overlap