OHV Chevy 1928 head for a Model T

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Model T Ford Forum: Forum 2012: OHV Chevy 1928 head for a Model T
Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Deichmann, Blistrup, Denmark on Wednesday, April 25, 2012 - 12:12 pm:

One of my T buddies have got a 1928 Chevrolet OHV head. He have also found a source for the "Poor mans Rajo" kit (a thick plate of aluminium adapted for engine block and head.

He have a couple of questions -

* what pushrods to use? The Chevrolet rods or some special?
* will he have to bore out the valveguides in order to allow the pushrods to go down to the lifters?

Pictures are welcome!

Regards and thank you!


Top of pagePrevious messageNext messageBottom of page Link to this message  By John P. Steele-Rusty Montana on Wednesday, April 25, 2012 - 12:17 pm:

Michael Check out Neal Jern's website. The answer is probably there or he might be able to help.

http://jernthunderbolt.com/index.html


Top of pagePrevious messageNext messageBottom of page Link to this message  By Willie K Cordes on Wednesday, April 25, 2012 - 12:37 pm:

Neal has what appears to be some very detailed instructions. We have a TT truck with a Chevy head but I was not involved in the engine work.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Shawn Hayward on Wednesday, April 25, 2012 - 03:40 pm:

Hi Michael
I have been researching the info on that to,
I have priced it out with Neal Jern ,
and it is my understanding the pushrods come with the kit,
I have the head , he no longer makes the aluminum adapter , steal one only


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dare - Victoria Australia on Wednesday, April 25, 2012 - 05:39 pm:

Maybe thats the cause of the water leaks in the aluminium plates !!!
Shawn, what is that screen !! in the inlet ports ??

David.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Shawn Hayward on Wednesday, April 25, 2012 - 07:07 pm:

Hi David

I have no idea what the are????
was on the engine that way.
may be some kind of fuel saver???


Top of pagePrevious messageNext messageBottom of page Link to this message  By mike conrad on Wednesday, April 25, 2012 - 07:19 pm:

I had a 28 chev head It had the same screens It may well be stock. Have not a clue what they are for.


Top of pagePrevious messageNext messageBottom of page Link to this message  By joe bell on Wednesday, April 25, 2012 - 08:57 pm:

Micheal,
The push rods are fairly simple to make if you have a lathe to make the top part the rest is just .312 bar stock that you can order from Mc Master Carr, then flame harden the tips.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Aaron Griffey, Hayward Ca. on Wednesday, April 25, 2012 - 09:54 pm:

Back in "those days" it was believed that a screen or most any other obstruction in the intake port would cause little turbulances and the air and gasoline would mix better.
You know, double the horse power and at the same time get another 10 miles per gallon!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Thursday, April 26, 2012 - 06:35 am:

I've also got a 28 Chev. head lying around. It too had the sheet metal obstructions in the intake ports as in the picture above. No problem to pull them out and toss them in the scrap bin where they belong, even though they seem to be original. Original manufacturers can also be misinformed.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John W. Oder - Houston, Texas on Thursday, April 26, 2012 - 08:04 am:

I bought the whole shooting match from Neal - including rebuilt head. Very well made and thought out. The two piece push rods accommodate the fact that the Chevy has slightly differing bore spacings than the T.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Thursday, April 26, 2012 - 08:33 am:

The reason for OHV is to get more rpm and/or higher compression, to yield more HP.

Why not just use the whole Chevy engine? It has a crank and rods built to take the extra power/rpm possible with OHV. The Chevy crank is 25 lbs, and the T crank 15 lbs.

There are lots of compromises to adapt either a Chevy head or Chevy crank to a T block. Those would be eliminated with the Chevy block.

rdr
Fronty with Chevy crank and rods in T block.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Danuser on Thursday, April 26, 2012 - 09:20 am:

Rick if you run the complete Chevy block and all, you normally can't run in T tours, must have a T block


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Thursday, April 26, 2012 - 09:47 am:

Kinda's silly, isn't it.

A longtime member and officer in the Orange County T Club drives a '27 Chevy. She takes some ribbing.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John McGinnis in San Jose area, CA. on Thursday, April 26, 2012 - 09:50 am:

Given the head, crank and some hot rodding technology, the Chev should have been a good performer. Was it?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Thursday, April 26, 2012 - 10:19 am:

Its power, combined with a grabby cone clutch, was enough to break driveshafts and axles with some regularity...

I don't know its stock CR, but since the head is flat, the way to increase power is with popup pistons.

The Chevy tranny would give the T its badly needed second gear, at the loss of planetary. Compromises, compromises...

rdr


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stan Howe Helena, Montana on Thursday, April 26, 2012 - 10:29 am:

I disagree that those pieces in the intake were worthless. They may not help today but in the days of gasoline that was 55 octane and 30% Kerosene or worse those broke up the droplets of fuel so it would evaporate better before entering the cylinders and also helped to heat the cold fuel load coming in. The intake manifold was not heated -- take a look at a 28 Chevy. The engineers at General Motors had built a few million cars by then, they probably had a pretty good idea of what worked.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Thursday, April 26, 2012 - 12:33 pm:

While the intake was not heated because it was on the other side of the exhaust, it had a can that fit over the exhaust pipe with a flex steel pipe that went to the carb as preheater. It was a longer version of what Ford did.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Wayne Sheldon, Grass Valley, CA on Friday, April 27, 2012 - 05:27 am:

RDR,
I have to chuckle when I read your comment about Chevy pistons. Many years ago, I wrecked out some early Chevrolet stuff (I saved it from scrappers and sold it cheap to restorers at swap meets). A mid'20s engine that I only ever had parts of had 3/4 inch thick steel stock cut round and brazed onto the tops of all four pistons. Probably boasted the compression okay, but I doubt it helped the balance or rpm much.
Drive carefully, and enjoy, W2


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Friday, April 27, 2012 - 05:52 am:

I have a set of NOS aly Chevy pistons somewhere, without pins, if somebody needs them. I used the reinforced pins in my Egge pistons.

rdr


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Friday, April 27, 2012 - 06:31 am:

We have a guy in our local T club who tours with his 28 Chevy. It is not a particularly fast or reliable car. High RPM? No, it isn't!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Deichmann, Blistrup, Denmark on Friday, April 27, 2012 - 10:40 am:

The cone clutch disappeared at some point as I have made a Chevrolet '26 touring roadworthy once and that did not have a cone clutch:



The car in the foreground is my first car - Ford Junior de Luxe (aka. Ford Eifel or Ford Model C)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Saturday, April 28, 2012 - 08:59 am:

The 28 Chevy has a conventional dry single disc clutch.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Saturday, April 28, 2012 - 09:29 am:

Were they still breaking axles and driveshafts in 1928 models? Seems like people were as likely to carry a spare axle in a Chevy as a spare tire.


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