Eldert, Thanks for that. I did find them back when we talked about the ignition systems...whenever that was, a while ago. But you have stirred me on to catch...
I am a toolmaker with over 25 years of machining experience in Plastics, Aluminum, and Steels. I would be happy to quote any machining job you have. Lathe...
Hello all; I have an Aermacchi (Harley) sprint that I use as a roadracer. The motor is the 1974 model 350, which you most likely know is a single cylinder...
Initial thoughts on this is that if you can't reach redline down the straight then it is geared way too high. Acceleration around the rest of the track is...
RohanB
newboltz333@...
Jul 7, 2007 12:03 am
13490
Even while keeping the bike in 4th gear instead of shifting up to 5th, it cannot pull up to the 7,700 rpm I hope to be able to use. It can get close, but the...
... The easiest way I am aware of is shortening the stroke just a little and machining the cylinder and pushrods shorter. Peak torque RPM is a function of...
What is the stock compression ratio ? Scare us with a low number !!! You allowed to run alcohol (methanol) ? The classic racers here (Oz) use this, allows 12:1...
RohanB
newboltz333@...
Jul 7, 2007 12:52 am
13493
Interesting to think about, especially since I have a short stroke 250 motor waiting for a project to well up around it. For right now, changing the stroke is...
According to two older characters I was taught by, the correct way to make a parallel press fit crankpin for a racing motorcycle using a Nickle Chromium steel...
Under what conditions did you check the AF ratio? When at top speed what happens if you close the throttle slightly Does the float bowl vent to atmosphere? ...
... I check it during the practice and race as the system is permanently installed and reads out digitally right by the tach. ... I have not tried that yet....
You sighted these guys - race parts ? http://www.aermacchisprint.com/parts_room.php If they know what the secret trick is to getting performance, may save you ...
RohanB
newboltz333@...
Jul 7, 2007 11:19 pm
13499
Greg S, What does "Core refine" mean ? Ken A ... ____________________________________________________________________________________ Be a better Heartthrob....
Ken, Short answer is that I do not really know, at least as far as the mechanics of the process is concerned. I can not find a definitive explanation of the...
GS, In looking at the procedure, it seems possible that it is a post carburizing anneal or tempering process of sorts for the regions of material farthest from...
... It's probably a general term that covers several processes, I'd guess cryogenic treatment ( also called subzeroing ) would be one of them. As to making...
Ian
iwd@...
Jul 8, 2007 7:18 am
13504
Ian, I have to mildly disagree, unfortunately. I would not think that the heat treatment guy could readily confuse his terms because 'core refining' of EN36A...
... OK, but I've heard a similar term used for sub-zeroing. I use HT'rs who really know their stuff, the field is still more art than science, I tell them what...
Ian
iwd@...
Jul 8, 2007 2:50 pm
13506
All, I am not a metallurgist or a heat treater but I have some experience with fellows who are and a bit of hearsay or readsay on the subject. All agree that...
Ken, Lol.... Yes, like you, through a similar process of reading and listening I too have come to understand that rates of cooling that vary with depth for...
... than ... Wish I had heat treaters here I could trust! I think the guys I use are more into dancing around cauldrons and doing things with chicken heads and...
GS, The problems with heat treating metal are numerous, the pitfalls more so, the downside severe and we are at the mercy of people we can't monitor but that...
... I drop 4 or 5 pins off, 3 days & $50 later, go pick them up. These guys do all Holinger's gears ( or used to, Holinger has set up in house HT for his F1...
Ian
iwd@...
Jul 9, 2007 4:45 am
13511
Not sure if anyone mentioned this yet, but it's possible to feed oil from the side of the rollers in a big end bearing. The pin itself doesn't need any...
Greg ... Phil Pearson in England builds high quality pressed up cranks for our vintage BSA Gold Stars. He uses crank pins and big end needle bearings from GM,...
David Kath
BSAGS@...
Jul 14, 2007 7:05 pm
13513
An oil hole in a roller path is a huge stress raiser for the crankpin and the rollers. -- Dan Timberlake ... From: Jordan <jwprincic@...> Not sure...
Saw this today, thought it might be of interest... Hey everyone, don't know if you saw the race, but over the weekend we damaged a few bits and pieces here and...
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