5 bolt crank gear, SQUARE TOOTH!!!!!

[BadAssPerformance]

LOL yeah, about twice the mass!

Hey Todd, great pic/info! Check it out, I figured out how to turn posts into Tech Articles!

http://www.turbo-mopar.com/forums/co...r-SQUARE-TOOTH!!!!!

[GLHNSLHT2]

Attachment 29251Here is a pic of what you are looking for, and others to compare it to.
Todd

Todd, I'm not following the snout measurements. Is that their diameters? Looks like I'm going back to the yard and seeing if I can grab the crank pulley off that 88 Turbo1 K car with the impossible to find 88 kcar smec harness. No I'm not pulling it in the snow for anyone.

[shmedley]

I know I have one in the garage if nobody else can come up with one easily

[supercrackerbox]

My curiosity is piqued. With the different length, won't that push the pulley out too far for everything to line up? Can you have it machined down to the length of the common block one, since you'll be using common block accessories?

Oh, and I do have one, but it's on the motor in my GLHS. Sorry, off limits.

[BadAssPerformance]

Pretty sure the 4-bolt and 5-bolt crank accesory pulleys are different offset to take up the different timing sprocket lengths. I just looked for pics but couldnt find them.

[Juggy]

Good luck, its a Dodge reman messed up cross over year part,





It's not square tooth!

hey get those damn aluminum I sprockets going, and while your at it, have a 89 CB crank sprocket made up too in AL

[4 l-bodies]

Todd, I'm not following the snout measurements. Is that their diameters? Looks like I'm going back to the yard and seeing if I can grab the crank pulley off that 88 Turbo1 K car with the impossible to find 88 kcar smec harness. No I'm not pulling it in the snow for anyone.

Jay, yes that's just crank snout diameter. So in other words ID of sprocket.

[GLHNSLHT2]

As far as the weight thing, the diameter of the crank pulley is so small in relation to other things even if it's 3 times the weight of the 87 and older sprockets I doubt you'd notice or could measure it.

[supercrackerbox]

Pretty sure the 4-bolt and 5-bolt crank accesory pulleys are different offset to take up the different timing sprocket lengths. I just looked for pics but couldnt find them.

Yes, I know. But since he'll be using a pulley meant for a slightly shorter sprocket, won't he have to match that length to keep all the accessories lined up properly?

[minigts]

Pretty sure the 4-bolt and 5-bolt crank accesory pulleys are different offset to take up the different timing sprocket lengths. I just looked for pics but couldnt find them.

JT, so the 5 bolt gear off the 88 will cause a timing issue vs. the 4 bolt? I don't think you're saying this, but just checking. The length I get, but I'll be using the accessories off a TIII, so the alignment width offset from the wider 5 bolt crank gear will be matched. If I were trying to use the 87 pieces (assuming the belt would even work with the pulleys), I could see the issue. But I will be running the TIII PS pump, TIII alternator and TIII water pump. So as long as I have all those pieces, I should be good right? I shouldn't have a timing issue, correct?

BTW, John Roberts is running this setup on his car right now with no issues, so I know it can be done.

[BadAssPerformance]

Not a timing thing, just a position thing.

The belt pulley has a different offset to make up for the different length of the crank timing sprockets. I couldnt get to stock belt pulleys easily, but here is a pic of both types 4 and 5 bolt in Forward Motion underdrive pulleys for comparisson

You can also see the ID of each pullry is different to match the ddifferent sprocket snout diameters Todd mentioned.

[GLHNSLHT2]

someone didn't clearance the snow gaurd on the CB pulley before firing it up

[BadAssPerformance]

LOL, hey, 15 years ago we all were did it once

And this tech article wasnt around yet

http://www.badassperformance.com/mtech/ud_pulley.html

[4 l-bodies]

As far as the weight thing, the diameter of the crank pulley is so small in relation to other things even if it's 3 times the weight of the 87 and older sprockets I doubt you'd notice or could measure it.

I've often wondered why no one in the TD world ever produced an aluminum version of a crank gear. Pretty common in the 2.3 Ford world. The weight issue could be debated about forever. Steel vs. cast cranks, lightened or aluminum flywheels, iron cam pulleys, etc. each one no big deal but stacking them all together and it could become significant.
Todd

[GLHNSLHT2]

JT: So the 4 bolts need more clearancing than the 5 bolts? I've only ever installed a 5 bolt and noticed it wasn't sitting flat as soon as I put it up to the crank.

Todd: I guess. But I think there's bigger/better things to worry about being that the weight is centered so close to the centerline of the crank. A flywheel, UDP, and the cam gears offer much larger gains. And with how cheap the TD guys are then it's probably gotta be less than $20 for anyone to buy it I'm a rotating weight savings fanatic too and I don't think I'd buy one for more than that.

[BadAssPerformance]

JT: So the 4 bolts need more clearancing than the 5 bolts? I've only ever installed a 5 bolt and noticed it wasn't sitting flat as soon as I put it up to the crank.

Nope the 4 and 5 bolt UD pulleys both need about the same clearancing as the inner v-belt groove is in the same location with respect to the end of the crankshaft

[minigts]

Thanks for the pic JT!!! Hopefully this installation will go smoothly as soon as I find the gear. Still will have to pull the gear and mount everything up, but this should come out alright.

---------- Post added at 04:36 PM ---------- Previous post was at 04:34 PM ----------

Attachment 29251Here is a pic of what you are looking for, and others to compare it to.
Todd

Almost forgot, thanks for posting the pics!! Great to see the differences side by side.

[Reaper1]

I've often wondered why no one in the TD world ever produced an aluminum version of a crank gear. Pretty common in the 2.3 Ford world. The weight issue could be debated about forever. Steel vs. cast cranks, lightened or aluminum flywheels, iron cam pulleys, etc. each one no big deal but stacking them all together and it could become significant.
Todd

I've got a friend with a Ford 2.3 and he was running an aluminum crank gear. It ended up wearing out even though it was anodized. My theory on this is that he no longer runs a dust guard and dirt got in between the belt and the gear and eroded it away.

This is my reasoning for NOT wanting an aluminum crank gear.

[supercrackerbox]

LOL, hey, 15 years ago we all were did it once

And this tech article wasnt around yet

http://www.badassperformance.com/mtech/ud_pulley.html

Been there done that. Took me forever to figure out why I couldn't get the engine to crank over.

[glhs0426]

JT, so the 5 bolt gear off the 88 will cause a timing issue vs. the 4 bolt? I don't think you're saying this, but just checking. The length I get, but I'll be using the accessories off a TIII, so the alignment width offset from the wider 5 bolt crank gear will be matched. If I were trying to use the 87 pieces (assuming the belt would even work with the pulleys), I could see the issue. But I will be running the TIII PS pump, TIII alternator and TIII water pump. So as long as I have all those pieces, I should be good right? I shouldn't have a timing issue, correct?

BTW, John Roberts is running this setup on his car right now with no issues, so I know it can be done.

The '88 crank gear pulley attachment face is the same distance off the end of the block as a stock TIII. The TIII is the same distance as other common blocks. I had to open up the center register in the TIII crank pulley to fit over the larger register of the '88 gear.

I saw the gear you need today, but it was attached to the crank still in the car. All this was sitting in standing water from the rains so we couldn't pick it up. If you have the patience Andy and I will be picking this car up to part out sometime around June. LMK