Lightweight BSA style cam followers
- Thread starter Fast Eddie
- Start date
- Status
just a bit out of date!
heres a little drivle on the KENT / pushrod FORD Followers , for thrashing . https://docs.google.com/viewer?url=http ... er=5&w=847
9 / 32 & 5/16 in. stem . & earlyer still thinner still , so the foot falls off when the followers float with stock spings & 16 Yr old learner drivers in mothers car .
http://www.gobookee.org/get_book.php?u= ... 1lIFBhZ2U=
Seen a 10.000 rpm 1300 ' 711m ' , starts to run at 6.000 , on 45 webers .
cam data .
9 / 32 & 5/16 in. stem . & earlyer still thinner still , so the foot falls off when the followers float with stock spings & 16 Yr old learner drivers in mothers car .
http://www.gobookee.org/get_book.php?u= ... 1lIFBhZ2U=
Seen a 10.000 rpm 1300 ' 711m ' , starts to run at 6.000 , on 45 webers .
cam data .
The skeletonized Norton lifters are not hobot's > more like Ludwig's or Jim Schmidts past efforts, all too risky for me. I drilled one ~ 0.05" hole in the slab side of Peels and would also made tiny oil drain holes too but didn't get around to it, partly d/t the stellite pads. I thot about opening the oil drain bevels between each set with idea in mind to increase oil flow past the blocked spindle trickle but after season of hunting up oil cooling and heads i came across what Harley ran into so had to put that non-sense out of mind but added to worry there just ain't that much oil from above helping cam/lifter oil, must mostly be by the violent windage of crank/rod oil sling. Efficiency of mass location wise in valve train studies says its better to remove mass at valve side of rocker than lifter/cam side. In other words don't expect much just going with BSA unless valves lightened and springs strengthened with a hard hard heart to make em real show off their stuff. I've had two Norton twins over 9 grand on essentially factory lifters and there's plenty of stories of similar redlines prior to BSA upgrades. I had to juggle cost effectiveness in my next Peel so got JMS flat lifter cam.
Fast Eddie
VIP MEMBER
Hi Jim,jseng1 said:
What are the spring pressures with your beehive spring kits?
FE.
JS Beehive spring pressures
They have to be set up with the JS bottom washers for accurate comparison. You cannot use the stock bottom washers.
With the street bottom washers on a stock head the JS beehive springs are about 5 lbs stiffer than Stock springs that are set .070" from coil bind. The JS spring and retainer are less than half the weight of stock parts and with the lightweight BSA lifters you can rev to 8000 RPM without valve float with mild cams ( I have revved to 8200 or 8300 with JS0 cam). The lightweight parts put less wear and stress on the cam lobes and so the JS cams for radiused lifters last longer compared to stock parts.
With the thicker Racing bottom washers the JS beehive spring pressure is about 5lbs stiffer than RD racing springs that are about .070" from coil bind at full lift. I haven't found the RPM limit.
Racing specs - RD about .070 from coil bind - 250 lbs JS beehive about .070 from coil bind is 255 lbs
The street specs with thinner bottom washers are lower because the springs are not set near coil bind at full lift. About 220 or 230lbs at full lift with stock head depending on valve height and if the seats are ground down (pressure decreases).
They need special valves with the collets located higher.
I have all these numbers on a spread sheet and it won't paste well on this web page.
They have to be set up with the JS bottom washers for accurate comparison. You cannot use the stock bottom washers.
With the street bottom washers on a stock head the JS beehive springs are about 5 lbs stiffer than Stock springs that are set .070" from coil bind. The JS spring and retainer are less than half the weight of stock parts and with the lightweight BSA lifters you can rev to 8000 RPM without valve float with mild cams ( I have revved to 8200 or 8300 with JS0 cam). The lightweight parts put less wear and stress on the cam lobes and so the JS cams for radiused lifters last longer compared to stock parts.
With the thicker Racing bottom washers the JS beehive spring pressure is about 5lbs stiffer than RD racing springs that are about .070" from coil bind at full lift. I haven't found the RPM limit.
Racing specs - RD about .070 from coil bind - 250 lbs JS beehive about .070 from coil bind is 255 lbs
The street specs with thinner bottom washers are lower because the springs are not set near coil bind at full lift. About 220 or 230lbs at full lift with stock head depending on valve height and if the seats are ground down (pressure decreases).
They need special valves with the collets located higher.
I have all these numbers on a spread sheet and it won't paste well on this web page.
Fast Eddie
VIP MEMBER
jseng1 said:
Thanks Jim, that's good info.
Whilst on the topic of your Cams, Pete.V gave a Stirling endorsement of your stage 1 cam, with noticeably greater pull from 3750 rpm upwards.
What would the characteristics of the stage 2 cam be, just for interest? The engine is 850, will have your 34mm flatslides, TriSpark ign with Accel coil, and circa 9.6:1 CR.
Rgds,
FE.
Lightness is Rightness but costs the highest. Article on F1 exotic materials and air springs for the hi life side of power survival and some the loads to take. Do ya know how high a pitch 17,000-20kHz is to even hear? Imagine an 11grand Norton SNortin. Been looking at wheel material alternatives too. I keep wondering what ya'll street guys do with real Norton power that spins tire so dam easy its so much fun ya act like a squid with a chip on their shoulder, BLATTT!
http://www.pureluckdesign.com/ferrari/f1engine/
http://www.pureluckdesign.com/ferrari/f1engine/
Fast Eddie
VIP MEMBER
Thanks Jim! Stage 1 sounds more in line with what I want.jseng1 said:
comnoz said:
Try the Doug Helne works 500 Domiracer bucket camfollowers method-but you will need longer pushrods. And no, I don’t know how to do it either.
https://www.facebook.com/media/set/?set ... 123&type=3
go thro the slides until you see the Bucket cam follower;
http://images.search.conduit.com/ImageP ... t=0&pos=13
- Status