7 bolt girdle [Archive] - Page 2

s1ngletracker

12-29-2005, 05:22 PM

Most of the higher hp applications we "pin". This helps provide a positive center for the caps when assemblying the motor, and also helps prevent the cap from pivoting or "dancing" on main studs.
Most of the 7 bolt motors I have experience with have warped girdles. They are a pita to line hone, but I perfer the "interconnected" design.
Thats why we bush/pin the most 4g63/4g64 motors we do (or atleast recommend it). can you explain "pinning" a bit better? This is something new to me. Is this something along the lines of adding a pin that goes from the cap to the block to keep the cap aligned properly?

Goat Blower

12-29-2005, 05:40 PM

It's adding a dowel pin machined into the cap and the block that the main studs go through. It provides tighter clearances to supposedly keep the caps from moving at all.

I've been a little leary of the unsupported caps on the 2.4 as well. But I have no intentions of spinning mine past 8200 rpm, whereas Kiggly on NABR is spinning well past 10K on a 2.0. The 2G's also have a windage tray that bolts up along with the girdle. I had one to put on my 2.4, but it would have been easier to just make my own, and just got scrapped when time got short.

In short, yes, girdles are good. But most will probably never really need them.

niterydr

12-30-2005, 10:19 AM

It's adding a dowel pin machined into the cap and the block that the main studs go through. It provides tighter clearances to supposedly keep the caps from moving at all.

I've been a little leary of the unsupported caps on the 2.4 as well. But I have no intentions of spinning mine past 8200 rpm, whereas Kiggly on NABR is spinning well past 10K on a 2.0. The 2G's also have a windage tray that bolts up along with the girdle. I had one to put on my 2.4, but it would have been easier to just make my own, and just got scrapped when time got short.

In short, yes, girdles are good. But most will probably never really need them.
Nail with hammer, good post :). The caps DO NOT move with the pins in there.
I can't remember, but I think you can use 2.0 main caps on a 2.4 motor. Again, its an "I think" obviously you'd need to have the block line honed/possibly bored. I remember Mike saying something about it one time...

carltalon

12-30-2005, 05:17 PM

Here's a good pic of the pin around the ARP's on my motor.

niterydr

12-30-2005, 05:18 PM

Nice, Carl can we steal that pic for our motor building page?

carltalon

12-30-2005, 05:19 PM

Nice, Carl can we steal that pic for our motor building page?

Thats funny I stold it from the qpr page. Ive got a few more if you want them

AJ

12-30-2005, 05:23 PM

I took that pic, what a pussy motor though ;)

EclipseGST

12-31-2005, 01:51 AM

Now since this is a 7 bolt motor, would it be worth having it pinned or will the girdle be fine? I've heard may people say, always pin it. But isnt that what the girdle is for... To keep the main caps from pivoting?

1ViciousGSX

12-31-2005, 08:45 AM

Now since this is a 7 bolt motor, would it be worth having it pinned or will the girdle be fine? I've heard may people say, always pin it. But isnt that what the girdle is for... To keep the main caps from pivoting?Pinning it can't hurt