[Formulas]

the top HP on a dyno run does not always tell the whole story, attention must be paid to the whole power curve with intended useage in mind

[PAUL K]

Originally Posted by ponjohn

I don't understand why they're is even an argument with the data Cliff produced.
It was NOT anectdotal.
The combo pinged so hard it pounded the bearings out of the engine.
The rotating assembly was fixed and it no longer pinged and made way more power.

Here is the dyo sheet.

Seldom, if ever will you see a 15% gain in power from a cam change. If one does, most likely something else is going on. Even if one is not aware of any issues.

[ta man]

XR 276 224/230 .502/.510

OF 236/245 .570/574

[PAUL K]

Originally Posted by ta man

XR 276 224/230 .502/.510

OF 236/245 .570/574

How much performance did you gain from your last cam change?

[tom s]

OK,for grins here is the thread going from the 276 to SP.Tom
http://forums.maxperformanceinc.com/...d.php?t=804201

[ta man]

Originally Posted by PAUL K

How much performance did you gain from your last cam change?

Old Faithful to Old Faithful 2.0
Roughly 3 tenths and 3.5 mph.But a few things were changed.

different shortblock 462 to 466 cu inch,much lighter pistons CP Carrillo's
compression 10.25 to 10.8
heads reworked max flow 290cfm to 314cfm,new valvesprings retainers and keepers
intake port matched to new heads

[Stan Weiss]

Originally Posted by PAUL K

Seldom, if ever will you see a 15% gain in power from a cam change. If one does, most likely something else is going on. Even if one is not aware of any issues.

What would have be nice is after they put new bearings in, they had run the XR276 with the ignition timing where the engine wanted it, instead of where the operator wanted it which caused the engine to eat itself.

Stan