• Hi Guest!
    If you enjoy and benefit from your participation at British Car Forum, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR2/3/3A Camshafts and Valve Settings Conundrum?

Share this page

K

karls59tr

Obi Wan
Bronze
Country flag
Online
Hello All I asked this question years ago but am looking for new insights. Here are the specs for a Shadbolt 518 fast road cam: 227 degrees @.050"..... 280 degrees cam lift ........420" valve lift on 109 degree lobe c/1 The cam supplier is no longer available so I can no longer get the correct valve gap specs from him. I believe I have been running the car with the valve gap at at the stock .010 and it seems to run well enough but I would like to try and set the valve gap closer to the correct valve gap that the cam needs. I have heard that for a 270 cam I should run .014 intake and .016 exhaust? I have also heard that the cam I have is similar to a Kastner D grind cam which should be set at .014 Hot? As well specs are possibly similar to an Erson149 cam? Should I try .012 inlet and .014 exhaust to see what that is like???????
 
The .010" will be easiest on your drive line, so long as it's running well. The manufacturer grinds the lobes with a short "entry ramp", which takes up the slack in the valve train before the lobe starts the aggressive valve opening. Setting the valve clearance smaller will normally give the best performance and ensure you are not getting past the entry ramp on the lobe. With too much gap...past the entry ramp...the valve train gets hammered pretty hard. The worry about too little clearance is the chance that the valves are not fully closing, which will burn the exhaust valves in short order, and results in a terribly running engine.

So...always go with the manufacturer specs. But, if they are not available, I think you will be fine with .010 to .012" range. Check them once warm, just to ensure there is still some clearance when the valvetrain is hot.
 
This is from the Newman Cams website which my BP 270 cam from BPNW is a Newman cam. Presumably by the descriptions of the cams mine is the first one and valve clearances are listed although they are all the same. This being for a TR6, mind you…

4B32E5D1-EFA1-44AB-9C0B-F78BB99E3DA6.jpeg
 
Hamish Racing said:
my old 87mm engine ran 12-14 gaps
My new engine has similar to the 300 cam spec and runs 14-16 gaps
So very cheap engraving place created this for the top of the rocker box
Click to expand...
My engine is basically stock except for an exhaust header and a TR4 intake manifold so I am going to set the gaps at 12-14 and see how it sounds. (y) (y)
 
Similar threads
Thread starter Title Forum Replies Date
Joel Lester TR2/3/3A Are all "stock" camshafts the same? Triumph 9
B Anyone have spark advance data for Piper camshafts? Spridgets 1
Got_All_4 TR6 Any difference between 69 & 70 camshafts Triumph 3
S Camshafts Triumph 10
JPSmit trying to understand camshafts Spridgets 22
M Healey 3000 Camshafts Austin Healey 14
EMGEBE Camshafts.... possibilities... FUN!!! MG 3
B camshafts MG 6
Y MGB Do I need a heater valve? MG 1
K TR2/3/3A Installing silicone valve cover gasket Triumph 6
BierRunner TR6 Thank You - Heater control Valve Replaced! Triumph 1
BierRunner TR6 Removing the old Heater Control Valve Triumph 2
AngliaGT '97 Miata - Need to Replace the EGR valve - recommendations? Other Cars 7
K TR2/3/3A Valve rocker shaft questions..... Triumph 11
K TR2/3/3A Cylinder head valve stems and guides.... Triumph 3
BierRunner TR6 Heater Valve Triumph 20
Carlbanan56 MGB MGB valve seals MG 1
TomMull Valve lash Lotus 6
S TR2/3/3A tr3 valve spring compressor Triumph 5
R Valve Drain Pipe Austin Healey 13
R T-Series Valve gap for an MGTD 1953. MG 5
6 Valve Oil Seals Spridgets 10
K TR2/3/3A Cylinder head removal and valve adjustment Triumph 2
P TVR Big Valve 4.3 TVR 0
Erica General MG Oil Drain Valve -- mine is an MGB, but they have others MG 3
J MGB BRAKE VALVE ? MG 11
jehuie PCV valve explanation? British Motor Corp 5
R 3000 Heater Valve Austin Healey 4
T TR2/3/3A valve springs Triumph 15
kodpkd For Sale Alloy valve cover for AH 100-6 3000 PRICE DROP! Austin Healey Classifieds 1
T TR2/3/3A valve guides and piston clearance Triumph 6
kodpkd Valve Cover Gasket - Don't do this! Austin Healey 14
KVH General Tech Heater control valve/cable Triumph 1
G Valve Train Lubrication Austin Healey 1
KVH General Tech Valve Timing--No Marks Triumph 20
newmexTR3 For Sale TR2-4 performance valve springs, collars, exhaust seats, cotters Triumph Classifieds 0
D Water Valve Connection Austin Healey 4
R TR2/3/3A Rule 9 Valve Adjustment Triumph 8
RJS General TR Lever Shock - HD Shock Valve Triumph 2
JPSmit Product Review - air compressor drain valve. Harbor Freight Restoration & Tools 9
M TR5/TR250 Bypass valve Triumph 28
I Bugeye valve rebuild suggestions Spridgets 8
G Valve Cover Gasket Silicone Adhesive Austin Healey 5
J Oil Pressure Relief Valve Austin Healey 3
K TR2/3/3A An alternate valve adjusting sequence? Triumph 3
charlie74 TR6 ‘74 valve springs Triumph 0
Joel Lester TR2/3/3A What type of valve to use when rebuilding the head? Triumph 10
tj_tr3_tr6 TR4/4A looking for Machine Shop TR4 Valve Job Ventura - Los Angeles area Triumph 4
M TR6 PDWA valve Triumph 6
M Ray Juncal Valve Covers Austin Healey 5

Similar threads

Back
Top