Reground Cam ID?

Discuss all things Model T related.
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules

Topic author
Dan Hatch
Posts: 4110
Joined: Tue Jan 08, 2019 7:31 pm
First Name: Dan
Last Name: Hatch
Location: Alabama
MTFCA Number: 49974

Reground Cam ID?

Post by Dan Hatch » Sun Mar 26, 2023 10:56 am

I got a reground cam in a box marked.295 lift. How can I find out what it is? Thanks Dan

User avatar

Craig Leach
Posts: 1436
Joined: Tue Jan 08, 2019 12:22 am
First Name: craig
Last Name: leach
* REQUIRED* Type and Year of Model Ts owned: 1919 Firetruck/1922 Speedster
Location: Laveen Az
MTFCA Number: 26647

Re: Reground Cam ID?

Post by Craig Leach » Sun Mar 26, 2023 1:27 pm

Hi Dan,
Pics might help Chaffins regrinds have a distinctive profile to them that may be because the timing is changed on them?
Craig,


Topic author
Dan Hatch
Posts: 4110
Joined: Tue Jan 08, 2019 7:31 pm
First Name: Dan
Last Name: Hatch
Location: Alabama
MTFCA Number: 49974

Re: Reground Cam ID?

Post by Dan Hatch » Sun Mar 26, 2023 1:58 pm

Here picture
BABE9548-C9A4-4D56-947B-F2291BB5F8DE.jpeg
My question is how can I tell if it is .295 lift? There is an address label from Antique Auto Ranch, but I don’t know if this is the cam from them or where.
How do I measure lift without putting in block? Thanks Dan


tman1913
Posts: 52
Joined: Sun Jan 06, 2019 12:30 pm
First Name: Mike
Last Name: Bender
* REQUIRED* Type and Year of Model Ts owned: 1913 Canadian touring, 1924 Roadster, 1926 Mercury speedster, 1927 Roadster p/u, 1920’s bobtail dirt track racer
Location: Tulsa OK
MTFCA Number: 21160

Re: Reground Cam ID?

Post by tman1913 » Sun Mar 26, 2023 2:08 pm

Measure the base circle. Measure the lobe. Subtract the difference that will give you the lift


speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

Re: Reground Cam ID?

Post by speedytinc » Sun Mar 26, 2023 2:09 pm

Measure the lobe @ its tallest point & subtract the diameter measured 90 degrees. (the minimum) = cams net lift. Of course some lift is lost in the valve lash.


Topic author
Dan Hatch
Posts: 4110
Joined: Tue Jan 08, 2019 7:31 pm
First Name: Dan
Last Name: Hatch
Location: Alabama
MTFCA Number: 49974

Re: Reground Cam ID?

Post by Dan Hatch » Sun Mar 26, 2023 2:16 pm

Thanks guys. It is a .295 lift.

User avatar

Craig Leach
Posts: 1436
Joined: Tue Jan 08, 2019 12:22 am
First Name: craig
Last Name: leach
* REQUIRED* Type and Year of Model Ts owned: 1919 Firetruck/1922 Speedster
Location: Laveen Az
MTFCA Number: 26647

Re: Reground Cam ID?

Post by Craig Leach » Sun Mar 26, 2023 3:05 pm

Hi Dan,
I just looked at every stock model T cam I have and none of them have a extra .042 of base circle to grind off and still not get into the shaft
of the cam and that cam still has a base circle larger than the the shaft. Maybe thats a high lift performance cam in a regrind box? If it's a
regrind I wonder what the lobe looked like before?
Craig.


speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

Re: Reground Cam ID?

Post by speedytinc » Sun Mar 26, 2023 3:17 pm

I see the first lobe heel is ground below the bearing surface. Likely a Chaffin grind.
I removed one for a growing knocking issue. It was also black finished. It did perform well.
This cam REQUIRES a front thrust washer set up.


speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

Re: Reground Cam ID?

Post by speedytinc » Sun Mar 26, 2023 10:24 pm

A compadre called me tonight about your cam. If there is a star stamped on the gear face, its from Antique auto ranch.
If so, it was a favored montana 500 cam for a while. Would be a good performing cam.


ModelTWoods
Posts: 1048
Joined: Tue Jan 08, 2019 10:53 am
First Name: Terry
Last Name: Woods
* REQUIRED* Type and Year of Model Ts owned: 1927 Model T coupe, 1926 4 door sedan
Location: Cibolo (San Antonio), TX
MTFCI Number: 20180

Re: Reground Cam ID?

Post by ModelTWoods » Sun Mar 26, 2023 11:30 pm

speedytinc wrote:
Sun Mar 26, 2023 10:24 pm
A compadre called me tonight about your cam. If there is a star stamped on the gear face, its from Antique auto ranch.
If so, it was a favored montana 500 cam for a while. Would be a good performing cam.
Don't know about a star on the face; I've never noticed that, but Antique Auto Ranch (Tom Carnegie) does sell a reground cam, labeled as the "Montana 500" grind. They actually list it as .300 lift. I ordered one from Tom last year. I asked him if they performed well at low and intermediate speeds because of the lift and he assured me they would.


Topic author
Dan Hatch
Posts: 4110
Joined: Tue Jan 08, 2019 7:31 pm
First Name: Dan
Last Name: Hatch
Location: Alabama
MTFCA Number: 49974

Re: Reground Cam ID?

Post by Dan Hatch » Mon Mar 27, 2023 10:21 am

Just checked the face and SOB. There is a star. Guess this one of those cams.
90692BB9-2351-4F28-BB87-A19AC40DD2A1.jpeg

Post Reply Previous topicNext topic