DRC 7 cam

Fast Eddie · Jul 14, 2018

So, first question, what does DRC stand for, Dunstal Racing Components ?

A meaty looking cam though, anyone know owt about them?
https://www.ebay.co.uk/itm/NORTON-COMMANDO-850-750-RACING-CAM-SHAFT-PART-DRC-7-NICE-LOBES-GOOD-THREADS/312184444485?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=52976&meid=99b3804adebb4f409e78b4f97e32b37f&pid=100675&rk=5&rkt=15&sd=173400274749&itm=312184444485&_trksid=p2481888.c100675.m4236&_trkparms=pageci:b751aede-875a-11e8-b98a-74dbd180fcaf|parentrq:9897a6311640aad0a9f9b1a6fffdc62a|iid:1

dynodave · Jul 14, 2018

tall lobe, broad lobe, no oil slinger ring, no oil breather notches/can not use in stock 20M3S timed breather configuration, 73-75 850 core, welded hard face.
something like 4s or 7s. Highly doubt Dunstall related except as repop.

oldmikew · Jul 14, 2018

Dunstall cams were pressure fed , high lift, little dwell very much doubt this had anything to do with the old AMC raceshop or Domiracer cam from which Dunstall derived.. Looks more like 4s than anything

lcrken · Jul 14, 2018

Dunlavy Racing Cams. The DRC-7 was a grind made for HPI (Horsepower International) back in the '80s or thereabouts. It's .375" lift at the cam, .427" at the valve. At .020" lift the opening and closing specs are Intake 53°/84° and Exhaust 84°/53°. It's a serious race cam.

Ken

Fast Eddie · Jul 14, 2018

Ken you are an encyclopaedia!

Thanks for the info. Sounds a bit too hooligan for me though.

dynodave · Jul 15, 2018

oldmikew said:
Dunstall cams were pressure fed , high lift, little dwell very much doubt this had anything to do with the old AMC raceshop or Domiracer cam

fake news
corrected: I own several Dunstall cams and I was loaned several additional ones for inspection and profiling. Of those, only one, PDR2 B540 WCF, was finished for end feed oiler for the ramps along with the needle bearing conversion.
http://atlanticgreen.com/images/cam220.gif
I wouldn't doubt others were finished for oiler and bearing mod. But not ALL were as you claim.

oldmikew · Jul 15, 2018

dynodave said:
fake news
I own several Dunstalls and I was loaned several additional ones for inspection and profiling. Of those, only one, PDR2 B540 WCF, was finished for end feed oiler for the ramps along with the needle bearing conversion.
http://atlanticgreen.com/images/cam220.gif
I wouldn't doubt others were finished for oiler and bearing mod. But not ALL

oldmikew · Jul 15, 2018

But not all ' Dunstalls' were fitted with Dunstall camshafts the spec was surely open to the customers requirements and specifications.. Dunstall might in extremis just mean a bodykit with the engine untouched

dynodave · Jul 15, 2018

I should have said "dunstall cams" as I only own one dunstall prepared bike. This thread is clearly about cams and is specifically what I am talking about, NOT about bike specs.

oldmikew said:
But not all ' Dunstalls' were fitted with Dunstall camshafts the spec was surely open to the customers requirements and specifications.. Dunstall might in extremis just mean a bodykit with the engine untouched

This diversionary statement adds no credibility to your previous claim.

oldmikew · Jul 15, 2018

dynodave said:
I should have said "dunstall cams" as I only own one dunstall prepared bike. This thread is clearly about cams and is specifically what I am talking about, NOT about bike specs.

This diversionary statement adds no credibility to your previous claim.[/QUOTe

I care not for the above imputation. Most on this site when they say Dunstalls mean complete bikes not a particular component. But no matter. So which cams do you have ? I can only recollect the race cam and something called a street cam which did not run in needle rollers but I thought had pressure feed to the lobes but if I am wrong then ok Iam wrong . Certainly Dunstall did market the end feed kit seperately from the race cam.