Series V Cam Grind

[puff4]

Does anyone here know the complete specs for the original SV cam? I have what's in the manual, but little else:

Original Alpine SV grind
Duration intake ??
Duration exhaust ??
Duration @ 0.050 is ??
Intakes opens 29, closes 63
Exhaust opens 69, closes 23
??* overlap
??.???" valve lift )
Lash intake .010 exhaust .012

Also... I'm looking to understand Delta's KC and KB grinds... does anyone have the specs on those, as per above?

 

[jumpinjan]

Kevin,
If you look in this newsletter my article groups all the cam specs that I gathered at that point in time
http://www.sunbeamalpine.org/alpine_marque/issue_7/pdf

 

[puff4]

Thanks, Jan, that's very helpful in terms of the original grind for the SV... the lift is missing from the original WSM.

I wonder now if anyone has the specs for the popular grinds from Delta, the KC and KB grinds?

 

[jumpinjan]

Okay, I have a Delta box right here.
The KB is:
duration @ .016 = 265
duration @ .050 = 225
INT opens 28; Closes 66
EX opens 56; Closes 28
cam rise = .283, L/C 108 deg
Lash, INT = .014; EX .014

The L9 is;
duration @ .016 = 279
INT opens 34; Closes 66
EX opens 62; Closes 34
cam rise = .295, L/C 108 deg
Lash, INT = .018; EX .018

(what does L/C mean?)
Jan

 

[puff4]

Superb. So... from what I know so far...

Oh, and L/C stands for "Lobe Center" - i.e. the round bit.

 

[sunbeam74]

The KC is:
duration @ .016 = 262
INT opens 24; Closes 59
EX opens 62; Closes 34
cam rise = .284, L/C 108 deg
Lash, INT = .014; EX .014

Somewhere I have the specs for which I will have to dig out.

Racer Brown's performance cam
Hollywood sports car HC2
and a Weber dual plan (These are all old grinds)

 

[mightyohm]

Replying to a very old thread. These numbers are interesting. Why is the KB cam so popular with 1725 folks, when the stock 1725 cam actually has a longer duration (but slightly less overlap)? Wouldn't the stock 1725 cam give equivalent or slightly better performance?

 

[todd reid]

I can't answer your question definitively, but I expect the missing lift numbers for the KB might offer the explanation. More lift would equal more flow??

TR

 

[mightyohm]

Isn't the lift calculated as:
valve lift = lobe height * rocker arm ratio - lash?

If that is the case, the K-B has a lobe height of 0.283", so the valve lift would be

0.283" * 1.4 - 0.012" = 0.384" intake
0.283" * 1.4 - 0.014" = 0.382" exhaust

Isn't it surprising that the stock 1725 cam has more lift than the KB?

Jan, where did that 0.405" number for the stock cam come from?