Set of cams for sale on tardme http://www.trademe.co.nz/motors/moto...-452794022.htm The T140 has a really mild exhaust cam which knocks the guts out of them. The normal fix is to fit the 3134 exhaust cam , this boosts mid range but even Triumph says it is not a race cam. Question is, would I be better to buy these & get them reground for ' Winston ' or just stick with a 3134 or a Norman Hyde full race exhaust cam ?? Buggered if I know.
My memory must be fading, they look pretty lumpy to me. There were lots of different Triumph grinds, E3134 was always an inlet cam with various exhaust cams. At some point the Bonny got the 3134 for the exhaust, and of course everyone who put cams in a Triumph always put in two E3134's. Truth be known, the 3134 might not be the perfect exhaust cam, but you always have to go for the wildest cam for more power, right? Generally the exhaust cam will have less duration than the inlet....same as exhausts valves are smaller, it's harder to get stuff into the cyl than out of it. I don't know about the Hyde cams....I expect they are pretty smart these days, no guess work anymore. My brother had a T110 with Bob Joyner cams and 11:1 pistons and twin carbs, seemed to go well enough for me. Another time we found some welded and reground cams - I fitted them into a mates pre unit, and because I didn't know what they were or how to set them up, just set them 10 degrees either side because they were 20 degrees longer duration. ...so 44, 65, 65, 44. That bike always went like stink no matter what head or carbs were on it.
I thought the E3134 was just a part number..... my T110 had 3225's for both inlet and exhaust...seemed to go alright...for a 50's bike. All that separated it from a Bonnie was a second carb and the 3134 cams. Surely they must have improved on a cam from 1958....mind you the engine is mid 30's...... Spitfire cam grind , raise the comp and 32 Combat cams..... You should probably look at building another motor....... By the way Kerry ( Parkavemotorcycles) is a good guy, I've bought a few things off him.....pre unit crankcase....5 speed gearset......
3134 is a generic part number & seems to cover a range of profiles Reading the Stan Shenton bible , the works 650's used E6987 inlet & E6988 exhaust cams which are in fact the BSA Spitfire profile which provides usable power between 3000 & 7000. How hard to buy these cams & get them reground to Spitfire specs or is it better just to bite the bullet & buy the flash ones.
That's funny - I had a friend who always thought that BSA's had more bottom end than Triumphs, and so had a BSA grind done on his Triumph cams. All the performance Triumphs of the late '60s (Daytona,Bonny,Trident) had a very noticeable power surge at 4,500rpm and made max power at around 7,000 to 7,500rpm. But they revved much higher than that - the Daytona went to 10,000 no problem, I've personally seen 9,000rpm on the tacho (not my bike,so didn't push to 10,000) and revved my own with no tacho much higher. I've seen 8,000rpm on a Trident at half throttle, I reckon that's why they blow up. It's generally considered that the 650 (and 750) only goes to 7,000,and that's as far as I've taken them - but when Peter Groves (Mt Eden M/C Wreckers) raced his at Whangarei street races he reckoned he was loosing too much time on gear changes, so rode the whole circuit in 2nd gear...and said he was revving it to 10,000rpm. He's told me that story several times and is pretty adamant about it.
Pretty much what Shenton wrote. 9000 RPM out of a push rod 500 is not bad going . They limited the 650 to 7000. I read of a bloke in the UK who gets 7500 safely after doing some work on the valve train , lightened polished rockers, black diamond valves , 650 timing gear [ lighter than 750 ] , shims instead of Thackery springs, lots of little touches that all add up. I'll ring Franklin Cams in the morning & do a bit more homework, I'm after a bike that remains rideable & reliable rather than stovepipe hot.
Thrashme Wrote I'm after a bike that remains rideable & reliable rather than stovepipe hot http://www.trademe.co.nz/motors/moto...-446554104.htm
Meh , trainer wheels out each side don't do it for me.
Got then for $120, Franklin will regrind for $250 + GST . I think he puts the inlet profile on the exhaust. Knocks bottom end, everything happens over 3500, well, it is a race bike.
