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mattb

27-06-2011 07:54 PM

b4 spur on b44

does the b44 and b4 share the same spur gear?

thanks matt.

Mash Potato

27-06-2011 07:57 PM

They are 100% interchangeable but are different sizes from memory 81t b4 and 84t B44 or something similar to that, although there is every chance I've got them the wrong way around.

mattb

27-06-2011 07:59 PM

Quote:

Originally Posted by Mash Potato (Post 520517)

They are 100% interchangeable but are different sizes from memory 81t b4 and 84t B44 or something similar to that.

thanks mate my b44.1 came with a 81t,im just working out what spares to buy.

MiCk B.

27-06-2011 08:52 PM

Hi,

The kit spur on the B4 was 81t
Kit on the B44 was 84t
Kit on the B44.1 was 81t

(Think the B4.1 comes with 81 & 78)

MiCk B. :-)

Col	27-06-2011 09:21 PM

Whilst we're on the subject...

I fitted a B44.1 (81t) spur to my B44 the other night as it was the only 1 available, but left it with a 20t pinion (SP V3 6.5).
To save me cursing the world and throwing the car at the cat in disgust at my mechanical incompetence (I'd rather not change the spur again) what pinion should I be running? Only race indoor at york and outdoor at RHR

MiCk B.

27-06-2011 10:15 PM

You'll want the same overall as you were running with the 84t

So 84 - 20 is 10.50 overall

With an 81t spur a 19t pinion would give 10.66 over, as close as you can get between the two spurs.

Gear chart. (PDF document)

MiCk B. :-)

ian h

27-06-2011 10:35 PM

Quote:

Originally Posted by MiCk B. (Post 520606)

As a quick mental calculation you can normally assume that 3 teeth on the spur equates to 1 tooth on the pinion. So to keep the same approx ratio if you drop 3 on the spur then drop 1 on the pinion etc.

daz	28-06-2011 06:07 AM

Quote:

Originally Posted by Col (Post 520578)

Have you actually found out how a screwdriver works?

Col	28-06-2011 08:01 PM

Quote:

Originally Posted by daz (Post 520665)

Have you actually found out how a screwdriver works?

What's a screwdriver?

Col	28-06-2011 08:07 PM

Quote:

Originally Posted by MiCk B. (Post 520606)

So the internals in the diff's are the same beween 44 and 44.1? I only ask as the motor was coming off substantially hotter after a race than it did before

daz	29-06-2011 05:50 AM

Quote:

Originally Posted by Col (Post 521016)

So the internals in the diff's are the same beween 44 and 44.1? I only ask as the motor was coming off substantially hotter after a race than it did before

Thats right gayhead the internals are the same, you need to alter your pinion size to compensate for the smaller spur.

gazhillAE

29-06-2011 07:11 AM

Quote:

Originally Posted by mattb (Post 520515)

does the b44 and b4 share the same spur gear?

thanks matt.

Yes sure does

Col	29-06-2011 08:21 PM

Quote:

Originally Posted by gazhillAE (Post 521162)

Yes sure does

I thought we'd just decided that they don't...

B4 std spur is 81t
B44 std spur is 84t
B44.1 std spur is 81t

:p:p

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