Author |
Message |
kintail Samba Member
Joined: January 01, 2003 Posts: 594 Location: Canada
|
Posted: Wed Mar 22, 2006 5:20 pm Post subject: Serpentine belt vs stock - Cooling difference in T2? |
|
|
As most are aware the stock pulley system has some built in slip in it's engineering. The Porsche 356 pulley set-up spins faster and aids cooling temp for a splitty but still maintains slippage issue.
Serpentine belts by design should have less slippage and I wondered if anybody had noticed a difference in oil/head temps using this system over stock in a splitty?
Just curious...... _________________ Scott |
|
Back to top |
|
|
thevanillaninja Samba Member
Joined: October 10, 2004 Posts: 704 Location: Scott, IL
|
Posted: Wed Mar 22, 2006 5:45 pm Post subject: |
|
|
From what I've heard the use of serpentine belts versus V-belts is to prevent slippage at higher RPM's, mainly on race vehicles. The reason newer vehicles use a serpentine is to let one belt drive all the pulley-burdened accesories - a/c, water pump, power steering, abs, etc. Imagine all the belts you'd need! How big the pulley would be! Even some newer vehicles use V-belts for single accessories, mainly power steering and a/c, proving there's nothing wrong with the proven method.
I see no reason to NOT use a serpentine belt system, and it sure does look cool! but there's also no reason to not trust your V-belt for any stock app. - it's worked for that past 40+ years, why would it fail now? _________________ 1967 Zenith Blue Type 1 "Elaine"
Bought in 2004
Stored for 4 1/2 years and soon to be resurrected..
'67 beetle |
|
Back to top |
|
|
kintail Samba Member
Joined: January 01, 2003 Posts: 594 Location: Canada
|
Posted: Wed Mar 22, 2006 5:57 pm Post subject: |
|
|
I'm running the 356 and don't plan to changeover. Don't remember it being discussed before and though I would ask out of curioisty.... _________________ Scott |
|
Back to top |
|
|
derv Samba Member
Joined: October 12, 2005 Posts: 2600 Location: Oak Park (Chicago), IL
|
Posted: Wed Mar 22, 2006 7:16 pm Post subject: |
|
|
How about these 'BMD' pulley tensioners? What are the affects/advantages of these on cooling/slipage?
_________________ Jack
Quote: |
Mr. Hido: To post your bare ass to virtually all hardened bus enthusiasts casts thick, a slag not easily ground smooth. |
|
|
Back to top |
|
|
BarryL Samba Member
Joined: November 01, 2004 Posts: 14218 Location: Casa de Oro, California
|
Posted: Wed Mar 22, 2006 7:58 pm Post subject: |
|
|
In that picture it looks like a multi-gooved serpentine type belt. For normal engines I don't get the hype: they're too tight. Plus, some people have their v-belts twangin' like a high "E" guitar string. It's hard on the gen/alt bearing, the belt, and the #1 main. I've even heard some mechanics say it's hard on the crank to not be counter-pulled by another opposite device. When the engine gets hot the tower gets taller and the belt gets even tighter! |
|
Back to top |
|
|
thevanillaninja Samba Member
Joined: October 10, 2004 Posts: 704 Location: Scott, IL
|
Posted: Wed Mar 22, 2006 8:12 pm Post subject: |
|
|
Again, the advantage for those is use on full-out race cars where cooling isn't a major issue and long-term wear isn't a factor. Tighter tolerances allow for very little flex which our motors really don't like, though not an issue and actually a requirement for newer, water pumping engines for things such as the water pump (where it must be driven all the time and NO slop allowed to avoid aeration of the coolant.)
With the V-belt setup, adjustment is easy as we've all added or taken away a few washers to allow for more movement. Unless that system uses some sort of spring-loaded tensioner, there is NO adjustment available without a new belt; and belt sizes usually go by the half-inch which doesn't allow for any change in tension.
EDIT: I just saw there is a slider on the smallest pulley, which does allow for adjustment. That's a good idea, but still doesn't allow in-motion slop the way V-belts will. _________________ 1967 Zenith Blue Type 1 "Elaine"
Bought in 2004
Stored for 4 1/2 years and soon to be resurrected..
'67 beetle |
|
Back to top |
|
|
bill may Samba Member
Joined: August 27, 2003 Posts: 14160 Location: san diego,ca
|
|
Back to top |
|
|
|