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Tractor Pulling Discussion Forum

Re: Getting closer to starting up the new motor

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Dboll

01-21-2013 06:35:47
209.23.168.114



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Travis, I would like to cross paths somewhere and talk Case with you someday. A friend of mine has a 800 cube 900 gas 5 1/8x6.5, it ran really well at 3000rpm with a dsl. manifold, bumpy cam and a big carb. He slowed it down to 2000, re-cammed it and put on a governor and smaller carb.It didn't have good torque and had to fabricate a manifold with smaller runners (you would have to know this guy as it looks exactly like a cast manifold) It gained a bunch of low end. I realize in the natpa world you don't have much choice for a Case manifold if you are going to pull with them. I guess someone needs to make a good flowing manifold and come up with a bs story about it like the MM guys did. I am not sold on Bullet cams in these engines. The one in this 900 has reversion issues and makes the intake extremely hot, much more than the heads.

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Mopower

01-22-2013 06:46:30
64.208.152.151



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 Re: Getting closer to starting up the new motor in reply to Dboll, 01-21-2013 06:35:47  
It is my understanding people can cast anything, call it a replacement, and shazzam... legal manifold (but God forbid you modify an existing one to save a few bucks).



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MMMMMMMMMMMM

01-21-2013 16:20:10
38.123.14.49



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 Re: Getting closer to starting up the new motor in reply to Dboll, 01-21-2013 06:35:47  
The cam is your problem. There are better cams out there than Gary or Sonny. Sorry, but that's the truth.



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Josh Blackburn

01-22-2013 03:41:41
174.239.33.222



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 Re: Getting closer to starting up the new motor in reply to MMMMMMMMMMMM, 01-21-2013 16:20:10  
Give us some of your high power cam specs. I've used a lot of different cams and seen a lot of different cams run. Bakers have by far been the best. Baker and sonny have different cam profiles and durations. Comparing them is kind of like comparing apples to oranges.



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Travis M

01-21-2013 16:44:59
99.155.25.206



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 Re: Getting closer to starting up the new motor in reply to MMMMMMMMMMMM, 01-21-2013 16:20:10  
Well why don't you share the info and tell us where these better cams are at, or do you just like trying to start trouble on here



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MMMMMMMMMMMM

01-21-2013 17:05:32
38.123.14.49



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 Re: Getting closer to starting up the new motor in reply to Travis M, 01-21-2013 16:44:59  
Not trying to start trouble.

The cams they use have too much overlap. Shorten your exhaust duration, move your lobe centers apart a little and you will be amazed at the power increase.



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north puller

01-21-2013 18:55:10
74.198.9.9



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 Re: Getting closer to starting up the new motor in reply to MMMMMMMMMMMM, 01-21-2013 17:05:32  
what are these exact specs, duration and lobe seperation, and what rpm range are you trying to make power at?



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Travis M

01-21-2013 17:09:57
99.155.25.206



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 Re: Getting closer to starting up the new motor in reply to MMMMMMMMMMMM, 01-21-2013 17:05:32  
Ok sorry shouldn't have accused you of wanting to cause trouble. We haven't got this one started yet, but I always like information and will keep it in mind if we ever need to make changes.

Thanks



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Travis M

01-21-2013 10:53:56
12.189.255.94



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 Re: Getting closer to starting up the new motor in reply to Dboll, 01-21-2013 06:35:47  
Doug,
Yeah that would be great, hopefully someday it will happen. This motor is 5 x 7.5 and that is the 1030 diesel manifold. I"m not sure what the carb is off of, its pretty big though. We pulled a DC for many years that was 4.625 x 7, and it ran great. We won a bunch with it, but then the rear main failed and trashed the block. Its still sitting in the corner waiting for the day that we put it back together to run again. I"ve been toying with the idea of making it into a farm stock type pulling tractor, but we will see.

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dboll

01-21-2013 14:49:14
209.23.168.175



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 Re: Getting closer to starting up the new motor in reply to Travis M, 01-21-2013 10:53:56  
Yes you have to tie the rear main in a dc if it's a bigger build, I talked with Sonny today and he figures the manifold heat issue is a timing issue and not a cam issue, probably send him one for a 77 Oliver to do for me.



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Travis M

01-21-2013 15:38:50
99.155.25.206



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 Re: Getting closer to starting up the new motor in reply to dboll, 01-21-2013 14:49:14  
He did the cam in our last 900 and I didn't have any complaints, seems to be good. Gary did the cam in this motor I believe. That 470 inch dc we had ran real good. I can remember the pull that the block cracked, it pulled all that day but didn't sound right. We took it home and started looking it over and found the problem. Never pulled it again.



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