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Just got my crankcases back. Pointy cam fitment.

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Just got my crankcases back. Pointy cam fitment.
Started at 08:43pm on the 6th March, 2018 by stinkwheel
stinkwheel Subject: Just got my crankcases back. Pointy cam fitment.
Thought you might appreciate pictures of the work to relieve the crankcases for a performance exhaust cam. My local engineering mate did it. He didn't like the idea of just burring away the casting where the oil seal sits. What he's done is remove the cam spindle then centre the crankcase on his boring bar over the spindle hole. He measured the maximum OD of the cam arc, added the clearance then undercut the seal/bearing seat with the boring bar to that clearance.



Minimum clearance (pointy end):



Maximum clearance (blunt end):



Intact seat for oil seal:



On another note. This bike had killed its big end. He showed me the amount of metal swarf that had lodged itself between the primary side bearings. It was significant and Worth knowing about. If your bike eats a plain big-end, everything out!

My future seems to contain much ado with paraffin, a paintbrush and an airline.
Posted: 08:43pm 6th March, 2018
Barry N Subject: Just got my crankcases back. Pointy cam fitment.
A neat job done there Stinkwheel. I am looking forward to hearing your impressions of the 612 when its done!
Posted: 09:24pm 6th March, 2018
Alan R Subject: Just got my crankcases back. Pointy cam fitment.
Hi Stinkwheel-------Isn't it great having access to proper machine tools ??...........Well done your bloke !!..........Also well done you for not skimping on the job either...That seal holder looks OK, doesn't it ??........What camera are you using ?? Those photos really ARE worth the proverbial 1,000 words...Is it a trick of the light but your Exhaust follower shaft seems scuffed to me ??
Posted: 10:26pm 6th March, 2018
stinkwheel Subject: Just got my crankcases back. Pointy cam fitment.
It's a pretty basic nikon coolpix s33 compact camera. Also has the advantage of being waterproof and bright yellow.

In fairness, close-up flash photography is one of its weaker points, I normally use it for taking pictures on canoe journeys where it excells because I can use it one-handed. The trick with close up stuff is to hold it very steady and make sure it's focused properly on what you wanted it to, not always straightforwards with auto focus.

I see what you mean about the follower. It could well just be flash flare on the slightly more polished "working" section but I'll have a closer look at them.
Posted: 11:33pm 6th March, 2018
Leon Novello Subject: Just got my crankcases back. Pointy cam fitment.
Now would be a an opportunity to fit adjustable cam gear spindles, for quieter running, if they are not already fitted.
Posted: 05:59am 7th March, 2018
Bullet Whisperer Subject: Just got my crankcases back. Pointy cam fitment.
I fitted my last set of adjustable cam spindles a good few years ago in the 350 racer. One of them turned slightly, opening the exhaust valve enough to make the engine stop while in 2nd place on the last lap at Cadwell. Into the bin they went and solid ones went back in and we haven't looked back ...
Posted: 07:30am 7th March, 2018
Presto Subject: Just got my crankcases back. Pointy cam fitment.
Agreed Alan R! Excellent posting – and yes worth a 1000 words. Cheers!
Posted: 09:46am 7th March, 2018
stinkwheel Subject: Just got my crankcases back. Pointy cam fitment.
I got some adjustable cam spindles from India when I was originally going to do the whole remove cam spindle and gradually burr down the casing technique for the above (didn't know they were adjustable ones at the time, I just ordered cheap ones with the intent of effectively destroying one). I've been looking at them and it did ocurr to me that I would be introducing more moving parts into an already fairly complex system.

If all goes according to plan, I'll be using a crank-end ignition system so I'll be leaving out the idler gears and distributor shaft. As such ought to be a lot quieter than standard anyway (although I've never really found the valvetrain noise intrusive, maybe I'm used to it, I also ride a VFR750 with gear driven cams so I'm used to a high speed gear whine).
Posted: 10:10am 7th March, 2018
ric Subject: Just got my crankcases back. Pointy cam fitment.
But the Enfield suffers from low speed gear whine - totally different thing to VFR high speed gear whine ;)

Nice job BTW.
Posted: 12:58pm 7th March, 2018
papasmurf Subject: Just got my crankcases back. Pointy cam fitment.
ric, I can't hear any whine from my "Oilfield," probably because of all the other mechanical noises the bike makes.
Posted: 01:20pm 7th March, 2018
papasmurf Subject: Just got my crankcases back. Pointy cam fitment.
Posted: 06:51pm 7th March, 2018
stinkwheel Subject: Just got my crankcases back. Pointy cam fitment.
Hmmm. I suspect an "anti-social guttural racket" is what's going to emenate from this machine when it's finished judging by the very short, reverse cone mega our hosts have provided for it. That said, all I ever hear from the riding position is induction noise on my 350.
Posted: 07:01pm 7th March, 2018
Alan R Subject: Just got my crankcases back. Pointy cam fitment.
The only "Whining" I used to get from No.2 Bullet was from 'er indoors when riding pillion.....She never did like it...."It's noisy, leaks oil, it's a dirty Black with hand-painted Gold lining, won't go more than 55 mph and hard to start in the morning".........to which I replied}--- "Yes I know all that but what's WRONG with it ?? "
Posted: 11:37pm 7th March, 2018
Leon Novello Subject: Just got my crankcases back. Pointy cam fitment.
Some advice from Gurunandan. http://www.nandanmotors.com/camgear.html
Posted: 01:03am 8th March, 2018
Bullet Whisperer Subject: Just got my crankcases back. Pointy cam fitment.
Looks like plain scaremongering to me. It would take tens of thousands of miles for timing gear backlash to make any impression on the hardened surfaces of the timing gears. I would rather run slightly loose fitting timing gears and put up with a bit of extra noise, than leave my engine open to attack from adjustable cam spindles slewing around, but each to their own.
Posted: 07:33am 8th March, 2018
Chris Tindal Subject: Just got my crankcases back. Pointy cam fitment.
Thats the way to do it, proper careful job. Kind of opposite to yours, my 59 cases had an oil seal conversion, but the seal went right through into the cam area. I think late Redditch cases have a deeper cam cut out so there's just no room for an oil seal. I had a top hat style phosphor bronze bush made to plug the hole!  photo IMG_20171126_173601928_zpsj29as2tn.jpg
Posted: 09:12am 8th March, 2018
Adrian Subject: Just got my crankcases back. Pointy cam fitment.
Chris,

that's a nice looking job, though I think I'd prefer an oil seal where possible. Strangely enough the Electra-X has neither oil seal nor bronze bush behind the timing pinion (as standard), I think the intention was to rely on the high capacity of the gear scavenge pump to overcome wet-sumping. My old Electra would leak oil into the sump from the timing chest but somehow never smoked on start-up. Would that my AVL hybrid didn't....

Meanwhile if you look at the Indian 500 Bullet crankcases currently in our hosts' used parts section, you can see where the modification for the lumpier cam by the previous owner has sliced through the oil seal housing. I wonder if a custom bronze bush would be the answer to that one.

http://accessories.hitchcocksmotorcycles.com/Used-Parts-and-Bikes/Crankcases-bullet-Indian/37777

Stinkwheel,

I'm not sure the ignition side of the timing gears would have added much to the mechanical noise, as they're quite lightly loaded compared to the cam gears. Is your crank mounted ignition going to be an ignition generator only, or will it be the sort with added lighting coils?

A.
Posted: 03:30pm 8th March, 2018
Adrian Subject: Just got my crankcases back. Pointy cam fitment.
Chris,

that's a nice looking job, though I think I'd prefer an oil seal where possible. Strangely enough the Electra-X has neither oil seal nor bronze bush behind the timing pinion (as standard), I think the intention was to rely on the high capacity of the gear scavenge pump to overcome wet-sumping. My old Electra would leak oil into the sump from the timing chest but somehow never smoked on start-up. Would that my AVL hybrid didn't....

Meanwhile if you look at the Indian 500 Bullet crankcases currently in our hosts' used parts section, you can see where the modification for the lumpier cam by the previous owner has sliced through the oil seal housing. I wonder if a custom bronze bush would be the answer to that one.

http://accessories.hitchcocksmotorcycles.com/Used-Parts-and-Bikes/Crankcases-bullet-Indian/37777

Stinkwheel,

I'm not sure the ignition side of the timing gears would have added much to the mechanical noise, as they're quite lightly loaded compared to the cam gears. Is your crank mounted ignition going to be an ignition generator only, or will it be the sort with added lighting coils?

A.
Posted: 03:30pm 8th March, 2018
Adrian Subject: Just got my crankcases back. Pointy cam fitment.
Sorry, double clicked on the Post Reply Button by mistake, please could our moderator kindly ditch the duplicate post? Ta. A.
Posted: 03:32pm 8th March, 2018
stinkwheel Subject: Just got my crankcases back. Pointy cam fitment.
Hoping to fit one of the electrex ignitions with the AC/DC output (Mmm, vernier scale ignition timing built in). Been doing some research on LED lighting and AC and I think I can make effective lighting with the fairly low power output they have. I also think I've come up with an elegant solution to run the tail light on DC with the headlamp/instrument lights on AC using the same switch (and a diode-protected DPDT relay).

I'm going to do some test fitting of bulbs in the 350 to see if they actually work effectively but the upshot of what I've found out is you can use LED bulbs designed for positive earth on an AC system, with the exception of a stop and tail (hence the relay). May just use lighting relays anyway, it saves reliance on switches which can cause a lot of power drop.

The idea is to hide a tiny AGM battery and the bulk of the electrics inside the redundant tea caddy air filter housing.
Posted: 05:01pm 8th March, 2018

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