• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

TR2/3/3A Anyone familiar with Camshaft Specs out there?

Share this page

K

karls59tr

Yoda
Bronze
Country flag
Offline
If a person has been using P .012 on intake and exhaust valve gaps with such a cam and the car goes like a rocket would this setting cause any damage? If the valve gaps were opened up to .014 and.016 would there be much of a noticeable increase in power? Would there be a louder clatter with the .014 and 016 ? I finally found the receipt for the cam from Shadbolt in Vancouver BC,no longer in business. Here is what is known about the cam: M518 *duration @227"@.050"(280 degrees advertised) .280" camlift .420" valve lift on 109 degree lobe c/L .....Valve gap not on receipt. I did phone them many years ago to find out the preferred gap but lost that info. Any thoughts on this? Karl
 
Last edited:
Hamish Racing said:
I run
Inlet 0.014
Exhaust 0.016
And the tappets aren’t noisy
Click to expand...
Is the profile of your camshaft similar to mine? Do you recommend I open up the valve gap clearances to 0.014 and .016? My car is basically stock other than a header so I wonder how much of a difference it would make. Your motor is probably more of a race engine.
 
Decreasing the clearance will (very mildly) increase power at higher RPM. Likewise, looser clearance will favor lower RPM power band. Cams are designed with an opening ramp to take up a specific clearance without shocking the valve gear, while also preventing a valve from ever not closing. In laymen's terms...the cam is designed for a particular clearance...set either cold or hot as the manufacturer specifies.

Increased clearance must be done carefully, as it can shorten your valve train life if done in excess. Likewise, reducing clearance could lead to a situation where the valve does not close fully, which would cause backfires, crappy running, and burn your exhaust valves.

And...that's all I know about thaat!?!
 
Back
Top