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Author Topic: 750cc pushrod bike build  (Read 69834 times)

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Offline Cajun Kid

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Re: 750cc pushrod bike build
« Reply #180 on: April 03, 2010, 04:41:05 PM »
Randy,

Man that is a great looking bike,,, I like the paint job,,, man I can not wait to see it in person next week.

Drive safe.

Charles
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #181 on: April 03, 2010, 06:48:22 PM »
Thanks Charles, looking forward to talking to you again. See you next week.
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Offline ol38y

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Re: 750cc pushrod bike build
« Reply #182 on: April 03, 2010, 09:08:34 PM »
Nice lookin paint there Randy. Very good work all around.  :cheers:  Are you going to run open or APS? I have no idea about ECTA but I don't think your front fender is legal for open in SCTA. I'd hate for you to find out in impound... :-o
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #183 on: April 03, 2010, 09:17:18 PM »
Thanks Larry. I will run A-PF and A-PG at Maxton with that front fender. It is good for ECTA, but I would have to cut about a 5 inch wedge out of the front for SCTA. I am only going to run APS-PG at Speed Week with a full fairing.
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #184 on: April 14, 2010, 10:35:46 AM »
The April meet is complete with the usual first time out "growing pains." The bike easily passed tech and performed flawlessly. The only problem came from my gearing set-up. When I purchased all my sprockets, I was still planning on running the turbo from the start. When I decided to start without it, I didn't buy any larger back sprockets. I went with my slowest turbo set-up that put me at the low 130's in 5th gear at 7k rpm. I was hoping I could pull up to 120 with that set-up without the turbo, but it just bogged down everytime I shifted into 5th. With a couple more teeth in the rear sprocket, I'm sure I would be closer to the 120 mark. 110 was the best I could get out of it this weekend. My A/F ratio was running around 12 with WOT. This setting was much richer than tested, so it must be a result of the throttle position part of the circuit and not the general map. I'm still on the learning curve of the EFI system, so the information I have now should help me get up to speed next event.
I'm going to go ahead and put the turbo on before I run it again, so I shouldn't have to buy any more sprockets. The bike will go back on the lift and get the new turbo pistons, then I will fabricate the exhaust, plenum and try some program magic with the fuel mapping.



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Offline Stainless1

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Re: 750cc pushrod bike build
« Reply #185 on: April 14, 2010, 10:54:03 AM »
Randy, did you try a pass without going to hi gear?  What is your max speed capability at redline in 4th? 
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Offline Beairsto Racing

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Re: 750cc pushrod bike build
« Reply #186 on: April 14, 2010, 10:56:42 AM »
Randy,

Congrats on getting to this stage. Getting a new bike through tech and making some shake down passes is just one step closer to putting it in impound.
The paint job is very sharp!

Cheers,
Scott
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Offline Cajun Kid

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Re: 750cc pushrod bike build
« Reply #187 on: April 14, 2010, 10:56:58 AM »
Randy,

Good to see you and the bike this past weekend. I also enjoyed hanging out with you and Joe at the banquet.

The bike did good for it's "shakedown event"  See you in June.

Charles
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #188 on: April 14, 2010, 01:56:37 PM »
Quote from: Stainless1 on April 14, 2010, 10:54:03 AM
Randy, did you try a pass without going to hi gear?  What is your max speed capability at redline in 4th?  

On my last 2 passes, I shifted at 7k rpm. I have my rev limiter set at 7500 rpm, but I didn't want to go that high on on this first event, since the engine is new. The log graph looked like a nice sawtooth line from 1st to 4th and then a gentle curve in 5th to about 6K at the timing traps. I'ts possible it could have reached 7K in more than a mile and it's probable that it would have pulled to 7K in the mile if the A/F was around 13.5 instead of 12. I'm sure I will be able to make on-the-spot adjustments with my lap top as I get more familiar with the EFI system and software. This was a good learning experience for me and I'm very happy with the results.
My speed calcs with the various gear sets are on my shop computer that just stopped working, so I don't have the 4th gear top speed info right now.

Thanks for the comments guys  :cheers:


Charles, I'm sure looking forward to seeing the Studebaker in June!
« Last Edit: April 14, 2010, 01:58:55 PM by Rchop »
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #189 on: May 23, 2010, 11:00:59 AM »
Turbo installation is underway. A ton of parts have been ordered and they're coming in now. Oil scavange and pressure pumps, oil tank, fittings, boost gauge, boost controller plus lines and fittings. One thing I had to do was rebuild the intake manifold to be able to take turbo pressure. This included a new 1/4 inch thick aluminum flange welded to the intake airhorn and steel straps screwed to small aluminum mesas welded to the intake bodies. This picture shows the finished product being pressure tested...it passed!

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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #190 on: May 23, 2010, 11:01:38 AM »
New stainless pipes have been made and the turbo inlet flange made by Scott Stites has been fit to the pipes...

« Last Edit: May 26, 2010, 11:10:42 PM by Rchop »
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Offline Beairsto Racing

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Re: 750cc pushrod bike build
« Reply #191 on: May 23, 2010, 12:38:21 PM »
Very nice!! :cheers:
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #192 on: May 26, 2010, 06:41:02 PM »
Entire intake system has been assembled and pressure tested...it passed.


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Offline Glen

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Re: 750cc pushrod bike build
« Reply #193 on: May 26, 2010, 07:25:22 PM »
I love good craftsmenship, go fast
« Last Edit: May 26, 2010, 07:35:37 PM by Glen »
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Offline Rchop

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Re: 750cc pushrod bike build
« Reply #194 on: May 26, 2010, 08:00:35 PM »
Thanks, I hope to have it ready for the next Maxton event  :cheers:
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