Author Topic: Racer Resurrection  (Read 35385 times)

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Offline al_pritchard

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Re: Racer Resurrection
« Reply #120 on: June 01, 2017, 09:51:45 AM »
Did a dry engine build over the weekend, and took some measurements. Not sure I’m doing it exactly right, but here's to trying.

Cylinder Base to Deck: Left - 81.71mm and Right - 81.99mm
Cylinder Base Shim: 0.94 mm
Piston to Deck Height:   1.91 mm

Transfer port opens at 108° ATDC
Transfer port is fully open at 148° ATDC

Rear transfer port opens at 103° ATDC
Rear transfer ports is fully open at 178° ATDC

Exhaust port opens at 87° ATDC
Exhaust port is fully open at 154° ATDC

Rotary valve opens at 137° BTDC
Rotary valve is fully open at 100° BTDC
      
Rotary valve closes at a° ATDC
Rotary Valve is fully closed at 75° ATDC
* NOTE: Rotary timing is using the stock wiper. I’v not modified it yet.

Visual Timing


I’m going to go back any do the measurements again to double check.

Vinny’s idea of stepping the head into the cylinder is interesting. Letting me run without a head gasket. But I don’t get the feeling that 1mm is enough.

I’d love to hear some thought on deck hight, squish and head cutting.
Al Pritchard
Highlands, NJ

BS175 Racer

Offline bsracer

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Re: Racer Resurrection
« Reply #121 on: June 03, 2017, 11:07:40 AM »
Hey Al,

I just sent some heads off on Thurs to a guy who does a bunch of Kawasaki H2 stuff. I still need to get him the piston crown angle and the deck height. He wanted to see how they might weld up. I'm interested if he can do something like I've seen done on Suzuki GT500. An insert like they do for water cooled bikes. You use a heat transfer paste between the machined parts.

paul

Offline al_pritchard

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Re: Racer Resurrection
« Reply #122 on: July 05, 2017, 01:48:42 PM »
Hey Paul,

Very interested to see how that effort comes out. I’m having a hard time working out what direction to go with the heads.

On another note, who are you getting your tires from? I’m wondering if I’ll get lucky and be able to pick them up at NJMP weekend after next.

* Anyone else, feel free to chime in with a recommended tire dealer.

I’m thinking:
Heidenau K40R 2.50-18 Front
Heidenau K45R 2.75-18 Rear

Al
Al Pritchard
Highlands, NJ

BS175 Racer

Offline OldSwartout

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Re: Racer Resurrection
« Reply #123 on: July 05, 2017, 06:19:07 PM »
One of the AHRMA racers is a Heidenau dealer, so he'd probably be at NJMP, but unfortunately, I don't remember the name and he's not advertising on the AHRMA website.  He's probably in the AHRMA magazine, so you can probably check the ads there. 
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline bsracer

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Re: Racer Resurrection
« Reply #124 on: July 07, 2017, 12:08:27 PM »
Hey Al,

I just had some heads done. Not like the ones pictured. I'll post some pics when I can. I have been running the Heidenau's and they're ok. They change the gearing quite a bit from the Bridgestone BT39's.

paul
« Last Edit: July 09, 2017, 01:42:30 AM by bsracer »

Offline al_pritchard

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Re: Racer Resurrection
« Reply #125 on: August 21, 2017, 10:53:16 AM »

Keep me motivated Paul - Lets see some info on the heads.



Haven’t moved forward much, but I thought I’d check in and explain why.

If you’ve been following along, you may have noticed that the build had moved into my living room. Now I may have the worlds most understanding wife - but I will admit building a race bike in the living room is a bit of a challenge. So we began looking for a more “appropriate” location for my workshop. And we happened to stumble across a 1890’s farmhouse not far from where we live. With the best basement you could ask for. Fully dug out to 7' with a fresh painted slab floor. And did I mention someone built a bar down there. Long story short, we bought the house and moved last weekend. Still a lot to do to get the workshop us to speed. But it shouldn’t take to long.

At least she got to get out and see the sun


And arrived safe to her new home
[url=https://flic.kr/p/XSa1wj]

More updates as they happen.
Al Pritchard
Highlands, NJ

BS175 Racer

Offline bsracer

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Re: Racer Resurrection
« Reply #126 on: August 22, 2017, 11:25:52 AM »
Very Cool Al.

Congrats on the new house. I like both the idea of bar and workshop down below. I have a friend who once lived in a house (in San Diego) that had a trap door in the living room floor that went down to a bar with pool table in the basement.

I've slowed up on things a bit too. The guy I was building the motor(s) for pulled the plug. I was still in mid production on a bunch of parts. One set of heads was for me one for him. The rotary valve covers aren't done yet and I still need to move forward of the ignition. This sets me back a bunch of $$$ so I'll just try and regroup next year. I will try out one set of the new heads at Barber in October. I hope to get them on in the next week or two and replace the ignition gear that failed.

The pics are of the two new sets of heads. First is 12:1 with a 10cc trap volume (I think?) and the second 14:1 with a 8.8cc volume. Both are set up for a zero deck height.

paul

 


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