Rajo C-35

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Model T Ford Forum: Forum 2014: Rajo C-35
Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Paulsen - McPherson, KS on Sunday, August 24, 2014 - 12:26 am:

Hi all,
My father and I just picked up a Rajo head at a local auction. I believe it is a Model 35 or C-35.
Are a 35 and a C-35 the same?
We have or have had cars with a Rajo 30, Rajo 4-valve and Frontenac T heads. With all other variables being equal, how does it compare to those heads?
I got some good information from the B vs BB head discussion earlier but didn't find much on this head in the archives.
Thanks,
Chris







Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Sunday, August 24, 2014 - 12:41 am:

Hi Chris,

Yes, that is a Model C35 or the RAJO "Improved Head". Looks like the lower exhaust pipe end of your manifold has been repaired. Check the manifold as they usually are cracked in the middle due to over tightening. The Model C35 is a good performer and will fit well under the hood and are easy to install right up to the stock exhaust system. Here are a few photos of the C35 I recently restored and sold.
MTFCA RAJO C35 1.jpg
MTFCA RAJO C35 2.jpg


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Sunday, August 24, 2014 - 12:41 am:

Hi Chris,

Yes, that is a Model C35 or the RAJO "Improved Head". Looks like the lower exhaust pipe end of your manifold has been repaired. Check the manifold as they usually are cracked in the middle due to over tightening. The Model C35 is a good performer and will fit well under the hood and are easy to install right up to the stock exhaust system. Here are a few photos of the C35 I recently restored and sold.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Harold Schwendeman - Sumner,WA on Sunday, August 24, 2014 - 01:01 am:

Mark - Chris's pictures as well as yours both show a combination manifold. It's a RAJO manifold, and I didn't realize that RAJO made a combination manifold. I have a Wilmo combination on my stock '27 and I consider a combination manifold a nice accessory for a stock Model "T". However, I would think that properly designed and built headers would be of benefit to the RAJO head as OHV is all about better engine "breathing", and I would think that "breathing" (intake & exhaust) thru' a cast iron combination manifold would be somewhat restrictive as compared to a good set of headers. However, if the RAJO combination manifold was designed for use with the RAJO head, then obviously Joe Jargersburger didn't see a need for headers,......??? Just wondering,.......harold


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Sunday, August 24, 2014 - 01:57 am:

The combination intake and exhaust manifold works well with all ports on the same side. It allows for a pre-heat of the gases, prior to entering the combustion chamber. The cross flow heads (Model 31, B and BB) all had pre-heating which was pulled off of the exhaust manifold or through a port between the intake ports. The only exception was the Model BBR. I believe headers were only used on the BBR and were the design of their owner. The C35 is a good performer on a stock passenger car and also makes for a good speedster.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Paulsen - McPherson, KS on Sunday, August 24, 2014 - 11:06 am:

Thanks for the great information. I noticed the modified manifold. I'll clean it real well and look for cracks in the center of it too.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan McEachern on Sunday, August 24, 2014 - 12:45 pm:

Looks like a nice head- they run very well if you raise the compression by using a piston with a large dome on it. The cover is incorrect- that's a B cover- notice the recess midpoint in the side where there is no head bolt in your head.


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