ESE's works engine tuner

[monkeyfumi]

its creeping in to all sorts of stuff though its been in AP GP callipers since the 90's anyway.
.

Nope, not since they went four stroke in GP's anyway (not that anyone runs AP calipers anymore), MMC are banned for calipers (via a limit on youngs modulus).
Even the aluminium/lithium calipers are a thing of the past (cost cutting rules).

One widely known use of MMC was on the brake discs of the first model Lotus Elise, reported to last the lifetime of the car.
They were a great weight saving, but I think they weren't without some issues, and were eventually dropped for traditional cast iron rotors.

[jasonu]

Not sure when Speedpros 30hp version spat anybody off, if its true, Jason maybe you could quote a post.

Attachment 316551

There you are 30hp and a good spread of power, a usable 4,500 rpm. Not bad for 70's technology.

Pretty sure it hocked Dave Manuell down the road bad enough to screw up his shoulder.
As for the HP, it is one thing to make 30hp and good on those that did it but it is another to make 30hp AND make it reliable AND make it rideable.

[speedpro]

I was thrown down the road pretty good but that was on the 22hp engine and it was all my fault. Pretty sure Dave hasn't been down the road peddling the good motor. It actually did a good number of hours before it expired at Taupo last time out, with Dave on it. He just pulled over when it went off. I'd used it in my FZR and that was what Dave rode and then transferred it to Dave's Aprilia at which point Dave hurt himself but not on that bike, so Gary took to doing some laps on it at meetings. It was pulled prior to Dave being able to ride again. He is currently running my short stroke bottom end with the old 22hp aircooled cylinder. This is the engine he was running in the weekend when he reset his own lap record at Mt Wgtn. The 30hp engine is actually quite nice to ride.

[husaberg]

Nope, not since they went four stroke in GP's anyway (not that anyone runs AP calipers anymore), MMC are banned for calipers (via a limit on youngs modulus).
Even the aluminium/lithium calipers are a thing of the past (cost cutting rules).

One widely known use of MMC was on the brake discs of the first model Lotus Elise, reported to last the lifetime of the car.
They were a great weight saving, but I think they weren't without some issues, and were eventually dropped for traditional cast iron rotors.

Not sure if they are allowed to run AP in Moto GP AP still makes them for similar applications like Superbike
https://www.apracing.com/products/mo...t_caliper.aspx
They introduced them in the MMC callipers in 93.
https://www.apracing.com/Info.aspx?I...ProductID=2541
I assumed all the ceramic brakes were MMC.

---

[2T Institute]

Yea was confused by that pic. The barrel is MB100 but I thought you only got H100s over there. Perhaps there are H100s that use MB parts in some countries but would need new frames.

Mike has had 30hp from his, mine approaches that. Still more to come but OK for 1978 tech.

We only had 100cc not 125cc, even with 22 or so hp the power drop off from the large amount of cast iron in the cylinder was horrendous, then I learned about taper on the bore which stopped that somewhat. The LH crank main 28/62 bearing was problematic at those levels of power. 18:1 with A747 helped that to but think they lasted 3 meetings or 1 after a GP length track like eastern creek. As always would like to do it all again armed with what I know now

[peewee]

wobbly you still around ? on my next cylinder i figured i would try what tz350 did with the floor dam rather than spend countless hours welding and have to deal with all the distortion afterwards. my plan is a dam with just a few small weld beads to hold it in place. since the dam will be handmade im expecting a less than perfect fit to the floor with the possibility of a small airgap. i wasnt sure how that would affect the pipe or exh gas but i had a idea to put a piece of .035mm copper between the dam bottom and exh floor to act as a heat transfer bridge. what do you think ?

[F5 Dave]

We only had 100cc not 125cc, even with 22 or so hp the power drop off from the large amount of cast iron in the cylinder was horrendous, then I learned about taper on the bore which stopped that somewhat. The LH crank main 28/62 bearing was problematic at those levels of power. 18:1 with A747 helped that to but think they lasted 3 meetings or 1 after a GP length track like eastern creek. As always would like to do it all again armed with what I know now

Yeah we've only 100cc, 125s have carb restrictions.
Never found that bearing to be a problem. Maybe you had case alignment issues?

[husaberg]

Yeah we've only 100cc, 125s have carb restrictions.
Never found that bearing to be a problem. Maybe you had case alignment issues?

Odd pretty sure Mike has had isses with that side, I have too. Only ever that side I note the other side relies on the gearbox oil rather than petrol oil mix? What side to you run the phenolic bearing on Dave?
I always assumed it was the oil supply and the overhanging ignition that caused the issue maybe floating and a C4 would fix it. or a roller or ceramic bearing.

[F5 Dave]

Light YZ internal rotor most of the time probably helped. CR one since then. Think I didn't bother with phenolic after a while, just decent c3.

[speedpro]

Crank floats on that side plus the bearing is a loose fit in the cases and it's C4 clearance. No problem so far with the steel cage type.

Having said that the bearing that failed recently and bits of which took out my nice new Burris piston in Gary's bike was on that side. The cage failed and got smeared. It was probably the original one from Honda.

[F5 Dave]

Soichiro trying to nobble another 2 stroke huh?

[Frits Overmars]

wobbly you still around ? on my next cylinder i figured i would try what tz350 did with the floor dam rather than spend countless hours welding and have to deal with all the distortion afterwards. my plan is a dam with just a few small weld beads to hold it in place. since the dam will be handmade im expecting a less than perfect fit to the floor with the possibility of a small airgap. i wasnt sure how that would affect the pipe or exh gas but i had a idea to put a piece of .035mm copper between the dam bottom and exh floor to act as a heat transfer bridge. what do you think ?

A bridge from where to where? From the air gap above the copper to the air gap below the copper? It 's not going to work Peewee. Not even a press or shrink fit will do, as I learned when I removed the sleeve from my air-cooled racer and saw charred oil that had crept between the two. By the way, where do you find 0,035 mm copper? That's damn thin!

[Peter1962]

Frits, can you tell us if Harry is also testing on existing MX engines ? (in MX there is no limit on carburator diameter, and no restriction on the use of a electronic powervalve, programmable ignition or a powerjet) ?

[Frits Overmars]

Frits, can you tell us if Harry is also testing on existing MX engines ? (in MX there is no limit on carburator diameter, and no restriction on the use of a electronic powervalve, programmable ignition or a powerjet) ?

Not at the moment.

[peewee]

frits i dont know if it would make any difference but my plan was to weld the dam on all sides, preventing any oil or fuel from entering the airgap where the copper would be placed. then again maybe this copper idea is not even worth bothering with. was just something i thought of the other day. the thin copper is found here https://www.onlinemetals.com/merchan...7&showunits=mm