camshafts

[ModelT46]

how do you tell the difference for the 09-25 and the 26-27, camshaft and bearings,??

[Moxie26]

The 26-27 camshaft uses a shorter front cam bearing.

[DanTreace]

Here are dimensions to identify the ‘24 and later camshafts.

[NealW]

I've got a question about reground cams for the group. The picture below shows a stock cam/bearings that I removed from a 1922 engine that I rebuilt to use as the "driving" engine for our 1911 touring car. Below that is a reground cam that a friend gave me that appears to be from a pre 1924 engine, but reground that it could be used on any year engine.

My question is whether this reground cam could be used with a pre 1924 front bearing, or would the installer need to use a shorter 1924+ year bearing? The reason that I ask is that the 1922 front bearing does fit, but since the cam was reground, there is no aft thrust surface that the bearing to hit if for some reason there was a lot of for and aft slop. There must be some way to correctly install this reground cam, or someone wouldn't have gone to the effort/expense to regrind it.

Thanks,

Neal

[Moxie26]

Use the appropriate front cam bearing, either. Pre-1925 or 1925-27 to fit the front cam bearing surface. Reground cams will need oversized bearings and that has to be measured on each cam for the appropriate size. No matter if you use a pre or post front cam bearing the lock screw retains the bearing in the same position. To properly do the cam you have to take in account the center bearing and the rear camshaft bushing which may have to be replaced.

[Kerry]

Neal, the only way I would use that ground cam would be with one of the new designed brass thrust kit.

[speedytinc]

Front thrusting this ground cam is a must. If not, the cam moves in & out.
The cam lobe eats away @ the cam bearing halves making a louder knock over time.