Dellortoman
Hero member
- Location
- Tasmania, Australia
Only after you've patched up your relationship.
Building a race bike
- Thread starter julian
- Start date
sonicboom500
Hero member
Just a thought, but if brake performance can make such a difference would it be worth finding out if Questmead could give you an edge.
A pal that did some hillclimbing got some heat cycled backing plates re-lined with different compounds for hot/cold/wet conditions to give
more reliable performance. It meant he could use smaller calipers and pads that heated up faster.
A pal that did some hillclimbing got some heat cycled backing plates re-lined with different compounds for hot/cold/wet conditions to give
more reliable performance. It meant he could use smaller calipers and pads that heated up faster.
Hi,
For sure I will optimize the brakes as much as possible but there is no way in hell that drums will out perform discs in general and even though I think I will be able to get the drums setup to do a fairly good job even compared to discs in the class, I doubt they will be as consistent as this is usually the problem we have with the historic cars.
Watch this space
J
For sure I will optimize the brakes as much as possible but there is no way in hell that drums will out perform discs in general and even though I think I will be able to get the drums setup to do a fairly good job even compared to discs in the class, I doubt they will be as consistent as this is usually the problem we have with the historic cars.
Watch this space
J
GregT
Hero member
- Location
- Christchurch NZ
julian said:Hi,
For sure I will optimize the brakes as much as possible but there is no way in hell that drums will out perform discs in general and even though I think I will be able to get the drums setup to do a fairly good job even compared to discs in the class, I doubt they will be as consistent as this is usually the problem we have with the historic cars.
Watch this space
J
I still do a bit with drum brake racebikes. The modern asbestos free race linings are quite good but do lack the sheer power of the old stuff in my experience. The single biggest point to watch is to identify the drum liner material. A surprising number of Italian origin drums use a steel liner rather than iron...And it makes a big difference when it comes to lining...
The absolute best lining I ever found was an American Raybestos one in the early 70's. It was being used on a passenger trolley in a tunnel being bored here for a Hydro dam spillway. Weird colour, looked like mahogany, grabbed from cold badly but once warmed up it was good for a half hour production race in a Kawa mach 3.
Dellortoman
Hero member
- Location
- Tasmania, Australia
GregT said:
That's impressive. Not the brakes, but that you got a Kawasaki Mach III to run reliably for half an hour
GregT
Hero member
- Location
- Christchurch NZ
Dellortoman said:That's impressive. Not the brakes, but that you got a Kawasaki Mach III to run reliably for half an hour
yeah, but it was pretty new then - and i was a lot younger so lasted the half hour....Don't think I could hang on to one for that long now.
Laverda SF
Hero member
I've been a building a Breganzie Sf Race Bike since 72 and when it hit 128mph I gave up, as I'm getting too old.
Not complaining as I didn't do 140 Mph with a 84 Suzuki Katana GSX and certainly can't keep up with Puppies saddling 200mph rides today.
Of course I went thought Pistons, Valves and Springs but gotta say that Bregazie Barrel and Tranny is a God Send.
Not complaining as I didn't do 140 Mph with a 84 Suzuki Katana GSX and certainly can't keep up with Puppies saddling 200mph rides today.
Of course I went thought Pistons, Valves and Springs but gotta say that Bregazie Barrel and Tranny is a God Send.
Greg,
The good thing with working all the time with these old cars is that they all run drums, even our race cars still use drums so we get used to it a bit.
We find that the Green brake co in UK has a lot of good linings and MosaFrein in Belgium are extremely good. Will experriment a bit though and we do have a 260mm Yam front brake so as good as it gets really. Fingers crossed.
LavSF
That reminds me of an old mate of mine, he used to race on the road and was completely mental, pissed on everyone with a tuned RD400, even big bikes on the country roads and I mean he made them look stupid. He was the local road race hero. Then he went real racing and was nothing special what so ever, Came nowhere, just a low number for years, The race track is the real place and only place in my mind for proving performance. Win there and you get my respect, until then its just talk the same as me until this bike works and proves it's self on the track.
Regards,
Julian
The good thing with working all the time with these old cars is that they all run drums, even our race cars still use drums so we get used to it a bit.
We find that the Green brake co in UK has a lot of good linings and MosaFrein in Belgium are extremely good. Will experriment a bit though and we do have a 260mm Yam front brake so as good as it gets really. Fingers crossed.
LavSF
That reminds me of an old mate of mine, he used to race on the road and was completely mental, pissed on everyone with a tuned RD400, even big bikes on the country roads and I mean he made them look stupid. He was the local road race hero. Then he went real racing and was nothing special what so ever, Came nowhere, just a low number for years, The race track is the real place and only place in my mind for proving performance. Win there and you get my respect, until then its just talk the same as me until this bike works and proves it's self on the track.
Regards,
Julian
Bleeding obvious but I expect you can get to 99.9% of what the bike can do on a closed circuit, some might even say 102% with a bit of luck. That's the measure of how good the bike goes. I spend enough just on the road, half a dozen trips to Reds is well beyond me. I envy those Mechanics who can do the high quality work racing needs on there own.Especially getting at last 2% out of what they have. That's the stuff I like to hear about, the cleaver stuff that makes them do well. And maybe trickles down to improve the road versions.
julian said:
Reminds me a bit of myself in my youthful years... :
Was always one of the
Reckon if I then had the bike(s) I have now, I wouldn't have survived.
Anyway, well and truely over that now. Looking forward to a safe and slowish season! (Well, one mad bash around the scottish highlands won't do any harm.
)piet
Robin Webster
Hero member
- Location
- Silverstone
Good man. Tell us more when you can.
Robin
Robin
R
Reggie3cl
Guest
(Well, one mad bash around the scottish highlands won't do any harm.
Enjoy that while you can- the Chinese are getting into independent holidays and they are shockingly bad drivers....
redax5 said:awesome Julian, living the dream, have no doubt end result will be impressive
but you never said a frame for what ?
fat triple or svelte twin
Svelte Twin my friend
Egli type backbone frame will be made by our Scandinavian friends http://jlmeccanica.blogspot.be/
Will be similar to the early type top engine mount type but with some changes to the rear mounts and some other bits and bobs. Made in 25CrMo4 nothing too special on material here as we will need repairability in the field. Nice and light though. about 11kg including swingarm and fastners.
Now going to set about lightening the engine and box.
Regards,
Julian
PS
Anyone who has got any info or suggestions about anything; please feel free to contribute, No one knows everything and especially not me.
chrisk
Hero member
- Location
- Brisbane, Australia
julian said:Svelte Twin my friend
Egli type backbone frame will be made by our Scandinavian friends http://jlmeccanica.blogspot.be/
Will be similar to the early type top engine mount type but with some changes to the rear mounts and some other bits and bobs. Made in 25CrMo4 nothing too special on material here as we will need repairability in the field. Nice and light though. about 11kg including swingarm and fastners.
Now going to set about lightening the engine and box.
Regards,
Julian
PS
Anyone who has got any info or suggestions about anything; please feel free to contribute, No one knows everything and especially not me.
Hi Julian
Frame looks the goods alright.
They sure use a serious amount of metal on the head mounts. I like the swing-arm.Looks forward to seeing more.
Hi Chris,
Yes, I like the earlier head mounting much better than the later type, leaves much more room for "imagination"
I will do something in 7075-T6 or 651 depending on availability. This has roughly double the strength of most commonly available Mag alloys so strength for strength about equal but without the drawbacks.
The swing arm will be oval for looks but will be of larger section to increase stiffness. (Box is best but looks horrid on a classic bike)
Pics as soon as it appears but think mid March, no rush as have "just a bit" of work on at the moment
Regards,
J
Yes, I like the earlier head mounting much better than the later type, leaves much more room for "imagination"
I will do something in 7075-T6 or 651 depending on availability. This has roughly double the strength of most commonly available Mag alloys so strength for strength about equal but without the drawbacks.
The swing arm will be oval for looks but will be of larger section to increase stiffness. (Box is best but looks horrid on a classic bike)
Pics as soon as it appears but think mid March, no rush as have "just a bit" of work on at the moment
Regards,
J
chrisk
Hero member
- Location
- Brisbane, Australia
julian said:The frame build has begun,
First parts in progress. Looking forward to it!!!
Also doing a redesign on the crank due to the new 63m stroke requirements. 87 x 63 Bore/Stroke now that is what you call "over square"
Julian
How many cc will that be?