New EV13 Measurements

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May 6, 2020 | 09:49 AM

#21

Dan89FLSTC

Seasoned HDF Member

Joined: May 2008

Posts: 21,143

Likes: 12,706

From: South Carolina

The easiest way to install a gear onto a cam:

Wrap the cam in brown paper and put it in a small box or cooler, cover with dry ice (the paper keeps ice from sticking to the cam).

Let it chill for an hour or so.

Heat gear to 300 degrees F.

Drop gear onto shaft, you will have a few seconds to align the marks before the gear gets tight on the shaft.

May 6, 2020 | 04:43 PM

#22

Yankee Dog

Grand HDF Member

Joined: Apr 2007

Posts: 3,725

Likes: 3,070

From: Brighton, MI

Quote:

Originally Posted by Rsbenden

Do yur own it's very simple, wipe w dykem n scribe 2 lines at the keyway on the factory cam. Press off the factory gear n take the new cam align the marks to the keyway n press it on.....done.

Great tip, just a plain old permanent marker will work if you don't have dykem...

May 7, 2020 | 02:34 AM

#23

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

Likes: 2,898

From: Bedford UK

Quote:

Originally Posted by texashillcountry

Damn dude you really love your caliper don't you???
The EVO motor isn't a modern day motor with very tight tolerances it's early 80's tractor technology.
Don't overcomplicate it....

Two pins is the correct way to measure a gear-wheel - it relates to the pitch circle I referred to above. Even easier to swap to the stock gear, as so many of us have suggested, which avoids the need to measure!

May 7, 2020 | 06:27 AM

#24

Architect

Seasoned HDF Member

Joined: Apr 2010

Posts: 9,562

Likes: 7,915

From: Long Island, New York

I am jumping in late here, but I agree with all that have suggested to swap the stock gear. This is the best thing to do all around for the engine, good luck.

May 7, 2020 | 06:57 AM

#25

EVO 4 LIFE

Stage IV

Joined: Oct 2019

Posts: 4

Likes: 0

From: Allendale MI

I appreciate all the info here. Going to put an EV13 in my ‘97 as soon as my broken Twinkie is back together.

May 7, 2020 | 07:44 AM

#26

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,093

Likes: 7,622

From: Poolville

Everyone here that knows me knows how many cams and builds I've had. I never swapped the gear and never had an issues... And yes you need the pins to properly measure the cam gear....

Dec 21, 2020 | 10:02 AM

#27

Garageking

Road Captain

Joined: Aug 2020

Posts: 516

Likes: 119

From: Athens Ohio

Quote:

Originally Posted by 98hotrodfatboy

Everyone here that knows me knows how many cams and builds I've had. I never swapped the gear and never had an issues... And yes you need the pins to properly measure the cam gear....

All of the most useful threads on this subject have the same forum folk patiently giving the same experienced advice to anyone hungry enough to learn it.
Wish I could buy you all a round of suds.
I am holding my EV13 in hand now contemplating the gear swap or no. gotta wait till tomorrow for a shim so started the search again for info.

Dec 21, 2020 | 04:17 PM

#28

Garageking

Road Captain

Joined: Aug 2020

Posts: 516

Likes: 119

From: Athens Ohio

"Not that it'll change my decision, but I ended up using two 7/64" drill bits (which measure 0.108" each...how lucky is that?) and repeated the measurement. The EV13 measured 2.750". The old cam measured 2.743",

If anyone lands on this, my 1998 RKClassic EFI stock cam seemed to mimic this result, but I had my pin one tooth off. After than the stock Cam was 2.750 and the EV13 was 2.749. Looks like plug n play in this case!

Last edited by Garageking; Dec 21, 2020 at 04:23 PM.