cogs....and tensioners. 2 topics
Thread Starter
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
cogs....and tensioners. 2 topics What actually are the problems associated with running a cogged drive for a centri blower ?? T56 car.
So I could be tempted to try a 50mm wide cog belt like the Aussies use on the Vortech setups that mine is based on originally.
Before I blew the crap out of my car, I had 2 smaller blower pulleys made for my custom 12 rib. I fitted the smallest, and above 6000rpm, I was losing boost....which I can only presume to be due to slippage.
I tightened the belt pretty good on my last blow up run, boost was still lower than with the old pulley combo I had been running.
Previously I was 8.25/3.0 I changed this to 8.25/2.90 as its easier...although I could have went 8.5/3.0, but that leaves the belt very tight to install, with less wrap.
Ive no idea how you guys dont get huge slip with 8 rib setups !!!! My wrap isnt even that bad, although could probably be improved with more idlers right at the blower itself to force more wrap.
Would a manual or automatic tensioner be better ?? for either cog or ribbed setup ?
So I could be tempted to try a 50mm wide cog belt like the Aussies use on the Vortech setups that mine is based on originally.
Before I blew the crap out of my car, I had 2 smaller blower pulleys made for my custom 12 rib. I fitted the smallest, and above 6000rpm, I was losing boost....which I can only presume to be due to slippage.
I tightened the belt pretty good on my last blow up run, boost was still lower than with the old pulley combo I had been running.
Previously I was 8.25/3.0 I changed this to 8.25/2.90 as its easier...although I could have went 8.5/3.0, but that leaves the belt very tight to install, with less wrap.
Ive no idea how you guys dont get huge slip with 8 rib setups !!!! My wrap isnt even that bad, although could probably be improved with more idlers right at the blower itself to force more wrap.
Would a manual or automatic tensioner be better ?? for either cog or ribbed setup ?
FormerVendor
Joined: Mar 2006
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From: Hell AFB
What actually are the problems associated with running a cogged drive for a centri blower ?? T56 car.
So I could be tempted to try a 50mm wide cog belt like the Aussies use on the Vortech setups that mine is based on originally.
Before I blew the crap out of my car, I had 2 smaller blower pulleys made for my custom 12 rib. I fitted the smallest, and above 6000rpm, I was losing boost....which I can only presume to be due to slippage.
I tightened the belt pretty good on my last blow up run, boost was still lower than with the old pulley combo I had been running.
Previously I was 8.25/3.0 I changed this to 8.25/2.90 as its easier...although I could have went 8.5/3.0, but that leaves the belt very tight to install, with less wrap.
Ive no idea how you guys dont get huge slip with 8 rib setups !!!! My wrap isnt even that bad, although could probably be improved with more idlers right at the blower itself to force more wrap.
Would a manual or automatic tensioner be better ?? for either cog or ribbed setup ?
So I could be tempted to try a 50mm wide cog belt like the Aussies use on the Vortech setups that mine is based on originally.
Before I blew the crap out of my car, I had 2 smaller blower pulleys made for my custom 12 rib. I fitted the smallest, and above 6000rpm, I was losing boost....which I can only presume to be due to slippage.
I tightened the belt pretty good on my last blow up run, boost was still lower than with the old pulley combo I had been running.
Previously I was 8.25/3.0 I changed this to 8.25/2.90 as its easier...although I could have went 8.5/3.0, but that leaves the belt very tight to install, with less wrap.
Ive no idea how you guys dont get huge slip with 8 rib setups !!!! My wrap isnt even that bad, although could probably be improved with more idlers right at the blower itself to force more wrap.
Would a manual or automatic tensioner be better ?? for either cog or ribbed setup ?
In your case, the vortech only has a 3.6 step-up so a larger dia crank pulley is needed to spin it properly.
Thread Starter
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
YSi has a 3.45 stepup...
Pretty much the largest crank I can do is the 8.5" I have ( used to use it before the last rebuild....I only opted for the 8.25" this time around, as I am now using a Mondo, and I reckoned my old BOV's had been leaking. )
or 86T cog.
If I opted for cogs, and good idler control of the belt.....then it should in theory be reliable ?
Pretty much the largest crank I can do is the 8.5" I have ( used to use it before the last rebuild....I only opted for the 8.25" this time around, as I am now using a Mondo, and I reckoned my old BOV's had been leaking. )
or 86T cog.
If I opted for cogs, and good idler control of the belt.....then it should in theory be reliable ?
FormerVendor
Joined: Mar 2006
Posts: 1,540
Likes: 0
From: Hell AFB
YSi has a 3.45 stepup...
Pretty much the largest crank I can do is the 8.5" I have ( used to use it before the last rebuild....I only opted for the 8.25" this time around, as I am now using a Mondo, and I reckoned my old BOV's had been leaking. )
or 86T cog.
If I opted for cogs, and good idler control of the belt.....then it should in theory be reliable ?
Pretty much the largest crank I can do is the 8.5" I have ( used to use it before the last rebuild....I only opted for the 8.25" this time around, as I am now using a Mondo, and I reckoned my old BOV's had been leaking. )
or 86T cog.
If I opted for cogs, and good idler control of the belt.....then it should in theory be reliable ?
