• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

TR6 Cam selection decision time could use your thoughts

Got_All_4

Luke Skywalker
Country flag
Offline
Got an Idea what I want to do but what would you do? Had my head milled, new hardened exhaust seats installed, going to do a light port job and port match the exhaust and intake manifolds.
Head came out to be 3.438" which is a bit over 9:1 compression with standard bore. I figure 9.125:1. Getting ready to send my cam to Delta cam shaft and looking at their 250 Sport cam and standard OEM lift roller rockers(146:1). My other option is to use the original Triumph cam with a step up in lift to 155:1 roller rockers. Just want a mild upgrade in horse power say around 115 to 120, good idle and reliability.

These are the specks on the Delta cam grind I'm looking at. Dur int 250 Dur exh 254, int opens 17, closes 53, exh opens 60, closes 14, cam rise .255 L/C 108 deg, Lash int & Exh .014
 

Attachments

  • scan0001.jpg
    scan0001.jpg
    60.6 KB · Views: 103

glemon

Yoda
Country flag
Offline
I have a similar compression ratio and Delta cam grind in my car. It definitely makes more power than stock with no lopey idle or lack of grunt down low. I also think there were at least 3 cam grinds for TR250/6. US spec early, which was very conservative, P.I early, which was less conservative, and the last grind that was used on all cars I think, that fell in the middle, just right range, and is an upgrade if you have an earky US cam.

I will see if I can find my Delta specs.

**EDIT**. Looked it up, you are looking at the same grind as I have. Not lopey nor cammy at all. Have not dynoed my car, but have run an electronically timed quarter mile, got a second off Road and Track's period stock quarter mile time without abusing the drivetrain. Shaved head, Delta cam, lightened flywheel, sport exhaust.
 
OP
Got_All_4

Got_All_4

Luke Skywalker
Country flag
Offline
That is the Delta cam speck chart I have pictured. I have the Low Torque Sport 250 in my TR250 but I have at lease 10:1, 155:1 rockers, heavily lightened fly wheel and a bunch more and my mechanic says it's over 150hp. Don't want that much in the 6 and yes no lope and the idle I can get down to 700 RPM. Just want reliability with a little kick in the pants.
 
Similar threads
Thread starter Title Forum Replies Date
J TR 4 Norris Cam 342S Spec Sheet Racing 1
PAUL161 T-Series Crane Cam MG 0
D TR6 Gp 2 cam, head shaved ,shorter pushrods, with a rough idle Triumph 10
M MGA RHD twin cam steering pinion MG 0
D Cam Timing question. Spridgets 11
J For Sale Triumph TR2, TR3, TR4 CAM SHAFT FOR SALE Triumph Classifieds 0
TomMull TR2/3/3A Steering Box Cam or Worm Triumph 18
S TR2/3/3A Replacing the cam shaft Triumph 27
K TR2/3/3A Rebuilding an Engine?..New Cam Sprocket & Gear...1/2 Price Triumph 0
Kolecki TR2/3/3A engine assembly cam timing issue Triumph 8
K TR2/3/3A Finding valve lash with cam specs? Triumph 8
Got_All_4 TR5/TR250 Cam and Lifter Problems Triumph 13
B Installing cam bearings 1275, can I do it? Spridgets 1
B Anyone have a Europa Twin Cam for sale? Lotus 6
J TR2/3/3A Confirming Cam Set Up Triumph 5
G Valve adjustment and easiest way set cam position Austin Healey 15
Walter74 Kent AH4 cam shaft Austin Healey 18
J General TR Cam shaft upgrade????? Triumph 3
S TR6 Quiz .... What cam is this? Triumph 0
J TR2/3/3A Triumph TR3 cam shaft measurement Triumph 2
B TR4/4A Front cam bearing Triumph 8
B TR4/4A Performance cam Triumph 24
K TR2/3/3A More pics of Kast Cam Triumph 4
K TR2/3/3A Kast f cam...301466 Triumph 5
L TR2/3/3A Cam follower rotation Triumph 5
Csarneson BN4 Cam Gear Install Austin Healey 3
N Best cam choice??? Spridgets 5
KVH TR4/4A I Replaced the Cam Bearings Triumph 19
M Wanted TR3/4 Cam Bearings Triumph Classifieds 1
R General Tech Cam measurement. Triumph 6
M TR2/3/3A Cam Bearing Tool Dimensions Triumph 16
W Cam gear position BJ8 Austin Healey 11
R TR6 Cam choices? Triumph 23
T TR4/4A Core Plug - Cam Rear change Triumph 7
D cam bearings Austin Healey 23
KVH General Tech Engine Rebuild: Failed at Cam Break-in Triumph 11
E TR6 Some cam questions Triumph 9
steveg Denis Welch mild cam Austin Healey 9
B Twin OH Cam for the BIG Healeys Austin Healey 15
K TR2/3/3A Street cam again and Valve gap? Triumph 6
K TR2/3/3A Mild street cam and Idle? Triumph 13
T Spitfire Cam shaft Triumph 3
J MGB MGB cam, gear? MG 3
K TR4/4A Performance Cam=Broken Rings??? Triumph 9
Marvin Gruber Cam shafts for 3000 Austin Healey 2
J TR4/4A Cam Timing with Head Still On HELP! Triumph 8
K Kastner "F" race cam. Racing 3
mgedit TR2/3/3A Cam Sprocket Bolts - Shoulder or not Triumph 6
B TR2/3/3A Positioning new cam sprocket Triumph 4
K TR2/3/3A Kastner "F" race cam again.... Triumph 3

Similar threads

Top