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Performance Cams ?

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Performance Cams ?
Started at 08:21pm on the 2nd October, 2018 by Andy C
Andy C Subject: Performance Cams ?
Trying to establish whether someone has fitted our hosts performance cams to my old bullet that I recently re acquired. 1. If I measure the lobe lift & subtract the base circle from it I get 9.63mm In & 9.3mm Ex I believe that our hosts current performance cams are +1mm up on this. 2. It looks like material has been removed from the crankcase to clear the cams. 3. There are no marks on the cams apart fromn E1 & I1 - believe our hosts now engrave the Part Nos on them. No signs of wear on the cams. Just wondering whether these either are performance cams from someone other than our hosts or an early version of their performance cams. Anyone shed any light ?
Posted: 08:21pm 2nd October, 2018
Andy C Subject: Performance Cams ?
Done a bit more research - pretty sure these are "Performance Cams" form our Hosts Part No 200180 as opposed to the "Fast Road" Cams Part No 90023.
Posted: 09:03pm 2nd October, 2018
Barry N Subject: Performance Cams ?
Hi Andy, the cams that came as part of my 612 kit were 90023. Hitchcocks data sheet states their lifts as: inlet 0.420 inch (10.67mm) and exhaust 0.395 inch (10.03mm). Yes, the main bearing seal boss has to be ground away almost to the point of breaking through to the seal, to accomodate the sweep of the inlet cam.
Posted: 09:54pm 2nd October, 2018
Mark M Subject: Performance Cams ?
Another possibility, Henry Price (PriceParts) does performance cams, does anyone know about these?

REgards, Mark
Posted: 10:18pm 2nd October, 2018
ChrisD Subject: Performance Cams ?
AndyC. I agree with your conclusion about the cams. My performance cams (PN 200180 from August 2010) have lifts as follows: inlet=0.3805” and exhaust=0.3597” (these are actual measured using a dial gauge on the pushrods) which agree very closely with yours.
Cheers, ChrisD
Posted: 07:14am 3rd October, 2018
Andy C Subject: Performance Cams ?
Chris - thanks for that. How do they compare to the standard cams performance wise ?
Posted: 06:23pm 3rd October, 2018
ric Subject: Performance Cams ?
about this much ;)

Torque chart OEM cams lower, Pricepart cams upper
Posted: 06:28pm 3rd October, 2018
Andy C Subject: Performance Cams ?
Ric. OK more is better - but what are the units of measure on the graph? How much more (presumably torque) is being produced ?
Posted: 08:11pm 5th October, 2018
ric Subject: Performance Cams ?
Andy C, There was no increase in maximum torque,the before and after figures (in whole numbers) were identical.
Posted: 08:38am 6th October, 2018
ric Subject: Performance Cams ?
and thinking about it that torque graph was for a set of Henry Price prototypes not Hitchcock cams I was given to try out.
Posted: 09:04am 6th October, 2018
Andy C Subject: Performance Cams ?
Guess it is impossible to compare the 2 unless you know the spec of the cams. Anyway, when I sold the bike it had the standard 500 cams fitted with a 612 conversion, these are certainly higher lift than the standard ones, and that lift is the same as our hosts "performance" cams. Anyway, the ultimate test will be through my built in dyno i.e. my backside when I get it on the road !! Lots to do yet but looking forward to riding the end result.
Posted: 07:12pm 6th October, 2018
Mark M Subject: Performance Cams ?
I was interested because I have a set of 'performance' cams I was given by a pal who acquired them with a Bullet project. I intend to fit them to the Bighead I'm building along with a 535 alloy barrel I've also picked up along the way. There are no markings on these either so I'll have to dial gauge them to see if they match the figures quoted. If in doubt I have some Redditch S type cams here and I'll compare them too.

REgards, Mark
Posted: 09:54pm 6th October, 2018
ChrisD Subject: Performance Cams ?
AndyC
The way I see it is that they did make some difference to top speed to my 1996 535cc Classic, but the rate of acceleration (mainly torque) was better so they were worth installing - especially since I upped the drive sprocket to 19T. Mind you the top speed is also governed by the carb as well and my 32mm isn’t enough to get over 80mph. Our main roads are dangerous at less than 60mph, so I needed a higher cruising speed than the auld beast was made with. I wish I hed a set of S-cams, they are apparently the bees knees.
Cheers, ChrisD
Posted: 09:22am 9th October, 2018
Adrian Subject: Performance Cams ?
The "S" cam is the Redditch Bullet touring profile while the "R" cam was the sportier one. I was recently able to compare a set of original "S" cams with a set of our Hosts' reproduction "R" cams (not the sports or racing cams in the accessory catalogue, they're different again), and to the untrained eye - mine - there wasn't a lot to distinguish the two profiles, so I'm guessing the timing is different. "R" inlet part no. 39376, "R" exhaust part no. 39378 if anyone is interested.

Where the "S" cams really do score in in tuning Electra-X models, funnily enough, though there have been some good tuning results in classic Indian-engined Bullets too.

If you want a set keep your eyes peeled, as they do come up on ebay UK and in our hosts' used parts section from time to time.

A.
Posted: 01:35pm 9th October, 2018
Andy C Subject: Performance Cams ?
Thanks for all the responses. Hopefully I can expect the motor to pull pretty hard then - I know when I owned the bike first time around it still had the standard Indian bullet cams so I am looking forward to a noticeable improvement. Checked the gearing earlier and it is running a 19t gearbox sprocket, depending on how well it goes I may look at a 20t sprocket. Not looking for out and out speed so no need to run really tall gearing. I'll keep you posted.
Posted: 09:10pm 10th October, 2018

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