Finding the right cam...

[Gordon Hunter]

Hi folks,

I'm building a B20 for road use.
I have here an 'F' cam which I am reliably informed has the following spec:

Valve lift 11.4
Knockvinkle (!) 111 deg. (ah, I think from b20f's link in my other post, this is a reference to the exhaust valve lobe centres)
Duration 300 deg.

I only have a very basic understanding of what these figures could mean, but from what I understand a 300 deg. duration may be too radical for road use?
So I was thinking of buying a well known and established cam such as the 'K' which I understand is a great cam for road use with the B20.
However as I already have the 'F' (it came with a job lot of parts) I would like to rule it out as a possibility first before shelling out any hard earned dosh on a 'K'.
Can anyone confirm my thoughts or offer any useful advice?
BTW what is a Knockvinkle when it's at home (sounds painful)?

Many thanks,

Gordon

[Derek UK]

http://forums.turbobricks.com/archiv...hp/t-4348.html

http://legolas.mdh.se/~mas95jed/volvo/tips.htm

Your F cam might not be for a B18/B20

Google is your friend..................

[Derek UK]

Extra............

Kamaxlar
Original och trimkamaxlar till B18 / B20:
PROFIL DURATION NOCKVINKEL VENTILLYFT 0-spel Information
A 248° 111° 8,9 mm Std i B18/B20 med enkelförgasare.
C 264° 111° 9,9 mm Std i B18/B20 med dubbelförgasare
D 280° 111° 10,8 mm Std i B20E t.o.m 1973
K 277° 111° 10,8 mm Std i B20E fr.o.m 1974
F 300° 111° 11,4 mm Rek för trimtopplock & dubbla 45r
R 287° 102° 11,6 mm Rek för trimtopplock & dubbla 45r
S 300° 101° 12,9 mm Rek för trimtopplock, full-race & dubbla 45r
10 280° 110° 11,1 mm Rek för trimtopplock & min dubbla 40r
17 285° 107° 11,1 mm Rek för trimtopplock & min dubbla 40r
19 in 312 / ut 292° 105° in 12,4/ut 11,25 Rek för trimtopplock. Bra gatkam.
6 312° 105° 12,54 mm Rek för trimtopplock & 2x45DCOE el 48.
5 320° 104° 12,9 mm Rek för trimtopplock. Som 6:an men +10hk..
MR 3 320° 103° 13,9 mm Rek för trimtopplock & 2x48. Kräver mushroom. Gärna rullvippor.

[classicswede]

If the cam has both oil pump and dizzy drive it should be the correct cam.

[Gordon Hunter]

Derek,

Again to the rescue! Thanks.

"F 300° 111° 11,4 mm Rek för trimtopplock & dubbla 45r"

I would hazard a guess to the "dubbla 45r" as being a reference to the cam spec being designed for use with twin Webbers.

This really would answer my question and confirm that I should just go for a K cam as I will be sticking with the SUs.
I checked with Simon at Brookhouse and he's doing K cams for not much more than a decent curry for two...

Well I'm getting there.
I'll let you know how the project goes.

Gordon

[Gordon Hunter]

Originally Posted by classicswede

If the cam has both oil pump and dizzy drive it should be the correct cam.

Yep, side to side to a D cam its definately the real deal.

Thanks Dai, I'll ring you soon about gassing the Rover.

Cheers,

Gordon