37T engine differences from 36T

Unknown

Apart from manifolds,inlet and exhaust ports,are there any differences between a 37T engine and a 36T? I plan to put a 37T engine in my 36,and hope to use the good crank and cam i already have from the 36(actually,i think the crank may be from a 34).It seems as though the valves are a different size,and im wondering about cam profiles etc.

hope someone out there has already researched this,cheers,skip

Geoff

'36 and '37 have the same valves. Earlier valves were 5/16" stem, and later were 11/32". There is no difference in cams, pistons, rods or cranks. All valve heads are 1-3/8" wide. The only thing you will have to change is the shape of the front pipe, as your '36 chassis is a lot narrower. If you are using your original '36 clutch you will be okay, but if you are changing the complete engine and transmission, the clutch throwout linkages are different.

Unknown

Thanks Geoff,exactly what i needed to know,will be using the original clutch and probably put a dogleg in the exhaust pipe to clear the frame.Cheers,Skip

Richard E.

Geoff, I think that they made the change to the narrow valve stems in '37. My '36 engine had the thick stems and I changed them and the valve guides.

Unknown

the 37 exhaust manifold will fit,but comes a bit close to the bottom radiator hose.I might have to make up some sort of shielding plate.It also will make removing the hose difficult as access to the bottom hose clamp is restricted.I dont want to have to take off the manifold to change hoses,any ideas? Are the valves different?

[Deleted User]

They went to the smaller stem size valves in 1938. Also went to no shims for the engine bearings along with using a palnut instead of cotter pins on the bearing caps. Hudson had trouble with camshaft and tappet wear and this cured the problem by going to a smaller valve stem size. They used these same valves 1938 -1947 Chuck G

Unknown

I'll go along with Geoff on this one. They changed to larger valve stems in 36 to my knowledge both on 6 and 8 cylinders to 11/32.

If you want a bit better performance use 5/16 , you get better air flow.

I have a friend that is a drag racing champion wiith a Chev 588ci 2/1/4 inch inlet valve head diameter 5/16 stems springs 1200 lbs. at 1 inch and has no problems with valve stems and guides.

Very interesting forum, maybe we are a bit different down under!!.

Rob

Park_W

Parts book confirms the change was made for '38. I'd always understood it was because the "fat stem" valves were a bit too prone to sticking. Can't argue with the breathing rationale either, but have a little trouble with the cam and lifter wear assertion. If the change was made to help that, it didn't work.

Richard E.

I think that Park has the last word on this one. Thank you, Park. Your wise counsel is always appreciated!

[Deleted User]

I agree in the fact i do not believe it effected cam and lifter wear like they said. But hudson states this in their 1938 Hudson service magizine. Chuck G

[Deleted User]

You can also find this in a great article on Hudson engines in the July/Aug. isssue of White Triangle news dated 2004 compiled by D.J. Kava where he takes the engines year by year and the improvements made each year.

ESSX28-1

Chuck G wrote:

You can also find this in a great article on Hudson engines in the July/Aug. isssue of White Triangle news dated 2004 compiled by D.J. Kava where he takes the engines year by year and the improvements made each year.

WTN Index available at:

http://socalhet.org/wtn_index3/az_index/uvwxyz.htm



Complete issues from Jan/Feb 2004 are stored on disk in the Club Library