Dry Lakes Racers Australia

I like the idea as a way to maximise Track 2. As our Records are now over a Mile x 2, if we make a change, I like option 1 on Track 2 provided we can afford the equipment.. For me it means Track 2 can 1: Potentially accommodate more runs per hour. 2. As it allows lower speed vehicles quicker turn of...

The pipes are slowly getting there.

Here is the new 300cc engine right hand pipe tacked together and my 250cc Jolly Moto Road Race pipes.

I'll fit the stinger/tail pipe once it's on the Bike.



Pete

I hope we don't have to shut the Forum down. Approving posts is the option I support, but it is also another job that needs to be done. Ramblingboy's suggestion make sense, see what others are doing. I just re read the Guidelines and we can all do our part by simply following our own rules. http://w...

gennyshovel wrote: ↑Mon Sep 27, 2021 9:14 am Who did you not raise the roof Pete

I'm not tall enough, Tiny

Pete

Apart from the Bike/Engine stuff, a part of Speedweek that is not often talked about is getting your weapon of choice there in one piece. My Trailer has been a work in progress. After three years I've finally extended the rear of the Trailer so the Long Red Bike fits in properly. This also rebalance...

This entire thing has been a steep learning curve, despite their physical simplicity, 2 strokes are complex things to modify and have evolved a lot since I raced and tinkered with my Short Circuit/Dirt Track CR125M in the mid 70's, and like all engines the HP/cc ratio has also moved on. Apart from t...

For all of you reading this post, and are wondering about 2 strokes, here is a little animation that might be helpful. This is a Crankcase Induction, Reed Valve 2 stroke engine similar to my engine. While this is air cooled and mine is liquid cooled, they both work in this same way. (There are other...

come'on fellas, set square and compass are a lot cheaper :lol: ,, last century when doing my apprentiship, marked out and cut by hand 100's of lobster backs of various angles to suit pipes up tp 3' in diameter (lagging on steam pipes in a sugar mill) :) Hey Ron I do have both of those, but I want t...

Hey Pete Good to see you found an error. The tuned length should stay the same with single or multiple cone diffuser. You can design and print the cones to bend in MOTA. Set the desired angle and number of pieces and press go. cheers Bones Hey Bones Yep it's a learning curve. I have the earlier MOT...

The other part of this is actually making these Pipes.

As this is a series of Cones welded together here is the software I use to make the paper templates I print out.



Pete

hey Pete I see the speed of sound setting is at 560ms, is that a default setting ?, or is it your setting based on exhaust gas temperatures ?? Hey Ron The default is 587ms, that is for the Works Engine which is more efficient than my engine. The instructions suggest a lower number based on the char...

Exhaust update: The earlier exhaust has been updated to a simpler "Single Diffuser" design with the same rpm/output. (thanks Bones) I made an operator/data entry error with the software as the earlier results did not make sense. (The three 1/2/3 diffuser design options did not line up and ...

Hey Pete Have you thought about using a single diffuser cone? Isn't the theory the single cone will give you a stronger returning wave at the expense of a narrower power band so hopefully more HP? If the RPM drop at each gear change is not too much it should work. I recently finished a set of pipes...

I've been working on some specific 300cc engine stuff. I am making new pipes as all my existing Exhausts are all made for a 250, so I can get a bit more power with the correct pipes. This Engine design software is based on data that two engineers from the Aprilia (2 Stroke) Works Team have shared si...

Hi there Jamiea, it's great to see another smoker making an appearance, and look forward to seeing you at Speedweek. It looks like you have the Rule Book, it's a good idea to download and print out the Rule Book and read it several times, it is a lot to take in. I suggest you then get in the habit o...