Bored Room
Anyone used these?
Looking at replacing the stock ones on my R100 Race Bike with lighter valves and titanium retainer for some peace of mind when running to 7500 8000 rpm
http://valvetrain.kpmivalvetrain.com...-5-motorcycle?
(Tosser comments will be sent to PD where they belong and red rep given)
DeMyer's Laws - an argument that consists primarily of rambling quotes isn't worth bothering with.
His Excellency
They have earned a good reputation in thumpers. FWIW
In the riders seat
The GSXR1000 we run in the sidecar has got them in and it's been given a hammering for the last few years with zero problems
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Originally Posted by scracha
i'm motarded
beemers don't blow up.
In the riders seat
They fucking do with you riding them
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
i'm motarded
that's cos I cant ride.They fucking do with you riding them
Low personal B.M.E.P.
They're very good - use them.
I've been caught trying to do odd size stainless valves and using blanks. Most aftermarket stainless stuff comes in 3 grades - and for an aircooled race motor you want the very top grade. Unfortunately some brands I won't name here are very poor at labelling the grades and you don't always get what it's supposed to be....Kibblewhite are exactly as described in my experience.
Bored Room
I've been running a stock BMW 308 cam which is ok but have picked up a proven German asymmetric cam. Also been using the valves that came with the engine, BMW 2 piece ones so looking to lighten the valves, put beehive springs and titanium retainers in.
Looked at fancy light pushrods and followers but at 250 and 300 Euros a set ...eek
Its not really worth the money given the rider does not have much talent.
Hey Norog....I thought you were moving on up from Bavarian Tractor Power?
DeMyer's Laws - an argument that consists primarily of rambling quotes isn't worth bothering with.
Forum whore
Go hard, I'm still going to beat you on a stock one.
I fixed my concerns about over revving stock parts, I smashed my tachometer to pieces in a massive crash & now I wouldn't have a clue what it revs to.
i'm motarded
Na given up in that idea, apparently you aren't allowed to run a reliable 46 year old stock engine.
You can just get some pushrods made, I have aluminium ones which have just been made with ali tube and had some generic ends press fitted. Ive only managed to bend one so far.
P.S. I weighed one against a standard old style pre 75 pushrod, and the difference wasn't even worth writing down, so I didn't, hence I cant remember what it was.
Low personal B.M.E.P.
I've been lightening rockers and making lightweight pushrods for years...it's not hard.
Why beehive springs ? Every time i've gone away from normal good quality parallel wind ones, I've had trouble.....
Edit - long time since i've had a BM bike engine on the bench, what dia are the pushrod ball ends ? I've got a couple of form tools here for doing alloy tips....
Two Wheels or Three = FUN
These "modern" racers seem to think they're all the rage.....apparently.
i'm motarded
8.65mm, and I didn't even have to google that.
i'm motarded
as it turns out I have far too much old shitter parts lying around, just found 2 push rods while looking for some sandpaper, 1 aluminium one and 1 pre 75 one.
Low personal B.M.E.P.
Well I don't have a form tool for that orphan size...It looks as though the OD of both rods is 10mm ?
Personally I've never used less than 12mm OD alloy tube for pushrods. If you're going light gauge, you've got to go up in OD to keep them stiff in my experience.
Best example was the Goggomobile TQ engine - very BM like and with pushrods about 15 inches long...
With springs and cam good enough - and supercharged - the std pushrods flexed enough that the timing figures when measured on the bench were all over the place. Went to 1/2in OD 16g alloy tube and it flew...Till it blew a cylinder off.
Nev - ever see valve springs with oval wire ? The kit for the first watercooled GSXR 750 used them. Absolute POS. A very short lived fashion.
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