Alternator bracket too short for Powermaster

[Hilljack68]

I just replaced the alternator with a Powermaster round back (68 Coronet w/ small block). Because the PM pulleys are a smaller diameter, I cannot tighten the belt. I'm at the end of travel on the brackets slot. Do they make a bracket with a longer length? Or can I use the other mounting hole on the water pump bracket? Any thoughts?

 

[Charles Cook]

Shorter belt????

 

[493 Mike]

Or longer bracket. Easy welding project.
Mike

 

[Hilljack68]

Shorter belt????

Ya know... sometimes I forget what a dumb *** I can be when I really try. It's times like these I wonder if my pot-smokin' days have finally caught up with me. Thank you sir.

 

[Charles Cook]

Ya know... sometimes I forget what a dumb *** I can be when I really try. It's times like these I wonder if my pot-smokin' days have finally caught up with me. Thank you sir.

 

[RJRENTON]

I just replaced the alternator with a Powermaster round back (68 Coronet w/ small block). Because the PM pulleys are a smaller diameter, I cannot tighten the belt. I'm at the end of travel on the brackets slot. Do they make a bracket with a longer length? Or can I use the other mounting hole on the water pump bracket? Any thoughts?View attachment 1682872

Just measure the existing belt's CIRCUMFERENCE (or pitch diameter if you prefer) and consult Gates or Dayco application charts for a belt with 2" to 3" SHORTER CIRCUMFERENCE or pitch diameter (with same width as origional belt)......no welding or fabrication required.
Formula:
more precise calculation formula is1) L=π(R+r)+2a+(R-r)^2/a(2) L=π(R+r)+2a+(R-r)^2/4a

Or take the old belt to the auto parts store and tell them you want, then compare old belt to a shorter one.
BOB RENTON

 

[Charles Cook]

I’ll break that down for you.

Shorter belt.

 

[kiwigtx]

I just replaced the alternator with a Powermaster round back (68 Coronet w/ small block). Because the PM pulleys are a smaller diameter, I cannot tighten the belt. I'm at the end of travel on the brackets slot. Do they make a bracket with a longer length? Or can I use the other mounting hole on the water pump bracket? Any thoughts?View attachment 1682872

Do you need a dual groove pulley alternator?

I only ask as the Vee centre is different if using a single groove pulley.....belt alignment is very important.

 

[Canadian1968]

I’ll break that down for you.

Shorter belt.

Wait .... it's that easy ? You don't need a big long winded explanation and calculation to answer the OP question... NO WAY!

 

[RJRENTON]

Wait .... it's that easy ? You don't need a big long winded explanation and calculation to answer the OP question... NO WAY!

I guess if you don't understand math, then "a long winded explanation" may seem like a foreign language......its just easier to criticize......
BOB RENTON

 

[Canadian1968]

I guess if you don't understand math, then "a long winded explanation" may seem like a foreign language......its just easier to criticize......
BOB RENTON

Understand math just fine, I even know how to properly write and define an equation ....

Good thing the answer is a shorter belt !

 

[Hilljack68]

I’ll break that down for you.

Shorter belt.

Yeah, the math made my brain hurt.

 

[Hilljack68]

Do you need a dual groove pulley alternator?

I only ask as the Vee centre is different if using a single groove pulley.....belt alignment is very important.

The original was a dual groove, as Nadine was born with A/C. The A/C is gone now, but I stuck with a dual groove anyway... so we should be good there.

 

[Hilljack68]

Here's a crazy thought: are big block tensioning brackets the same length as the LA brackets??

 

[moparsaver]

Yeah, the math made my brain hurt.

 

[RJRENTON]

View attachment 1683621

View attachment 1683622

Excellent......now, how about solving two simultaneous equations with two unnowns each or a matrix algebra problem (3 unknowns) or a simple differential equation???
BOB RENTON

 

[Charles Cook]

I got this,
Shorter belt.

 

[moparsaver]

Beat me to it!!

 

[Canadian1968]

Excellent......now, how about solving two simultaneous equations with two unnowns each or a matrix algebra problem (3 unknowns) or a simple differential equation???
BOB RENTON

Is this an advanced mathematics forum or a general public automotive forum ?

Another classic completely useless, arrogant post.

Awaiting the .... " if I'm to dumb to comprehend respone........." followed by some completely useless jibber jabber.

Don't forget... just my opinion...

 

[eldubb440]

Ya know... sometimes I forget what a dumb *** I can be when I really try. It's times like these I wonder if my pot-smokin' days have finally caught up with me. Thank you sir.

you just need to smoke more.......you've built up a tolerance