Toothed wheel - What do the numbers mean?

General Megajolt Questions and Answers

Moderators: JeffC, rdoherty, stieg, brentp

Post Reply
AL Mk1
Posts: 0
Joined: Fri Jun 17, 2005 9:59 am

Toothed wheel - What do the numbers mean?

Post by AL Mk1 »

I understand what the toothed wheel does, though people are talking about different sized wheels? What difference does this make and what do the numbers mean EG. 32-6 or 60-2 are a couple I have seen mentioned?

Cheers,
AL.
Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen

Paratime
Posts: 0
Joined: Sat Apr 17, 2004 12:47 am

Anyone seen my teeth?

Post by Paratime »

The standard design for the MJLJ is a 36 -1 toothed wheel on the crankshaft. 36 -1 means that there are 36 teeth evenly spaced around the outside of the wheel, with one missing (so there are actually 35 and a gap) to synchronize cylinder #1 TDC. If the engine is very unusual, or space makes mounting on the crank impossible, then a custom wheel can be made to mount on the camshaft, or in the distributor. Because both of these rotate at one half the speed of the crank, the wheel has to be made so that a gap passes the sensor every time #1 piston is at TDC. This is done by making double the teeth, with two gaps opposite each other, for a 72 -2 design.

AL Mk1
Posts: 0
Joined: Fri Jun 17, 2005 9:59 am

That's great, cheers. It i

Post by AL Mk1 »

That's great, cheers.

It is what I thought but wanted someone "in the know" to confirm!

Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen
Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen

petebroom
Posts: 0
Joined: Mon Jun 20, 2005 5:41 pm

you & your teeth

Post by petebroom »

We are intersted in making a toothed wheel to run inside our distubutor as we need to keep it to drive the oil pump & setting up a sensor on the crank pulley will be hazordous as we do a lot of off-roading and fear that it will be damaged. We understand the 72-2 tooth theory but are un sure to the smallest dimensions we can make the wheel. Also is there a sensor which could run at 90 degrees to the wheel i.e. vertical to a horizontal wheel. Anyone thought along these lines - Its a V8 (mate) - case you were wondering.

Who's/Is there a U.K. agent - We're in Devon, England.

fodderboy
Posts: 0
Joined: Mon May 16, 2005 11:21 am

dont know if youve looked at

Post by fodderboy »

dont know if youve looked at this option already

why not make a toothed wheel to fit on the flywheel similar to the ford enduro engine this has raised blocks machined into the flywheel (oposite side to the clutch) then the sensor points at the flywheel at 90 degrees
vertical to a horizontal wheel just like you mention but on a bigger scale

i dont know what you have to work with its just an thought

russ

Post Reply