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Scat fan shroud with heat
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Kiwi1966
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PostPosted: Fri Nov 16, 2018 4:40 pm    Post subject: Scat fan shroud with heat Reply with quote

Hi
Purchased a scat shroud with heat for a new 1776 build for my bay .Looking at the heat tubes in the shroud they are done totally different to a oem doghouse with heat and almost seem to be an afterthought. Any comments on this please- re loss of head cooling and actual effectiveness of actual output of air to the heat exchangers almost tempted to ditch this and track down a used german doghouse shroud
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Last edited by Kiwi1966 on Sat Nov 17, 2018 2:36 am; edited 1 time in total
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jeffrey8164 Premium Member
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PostPosted: Fri Nov 16, 2018 6:17 pm    Post subject: Re: Scat fan shroud with heat Reply with quote

I can’t speak to particular inefficiencies, but will say that it’s been common knowledge for what seems like decades that aftermarket shrouds don’t perform as well as original.
For some reason the aftermarket thinks we won’t pay for a proper part and thus create things as cheaply as possible. It’s probably their business model.
Then, there is the other side of the spectrum, that claims to have a superior product at an astronomical price.
Think Raby and Concept 1.
Both have shrouds with their own claims, and as I recall sell for around $400.00.
At any rate, you’re either shopping mass market or boutique. Boutique will always cost more because they’re hand made to order in most cases and hopefully not made on Monday.😉
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PostPosted: Fri Nov 16, 2018 8:00 pm    Post subject: Re: Scat fan shroud with heat Reply with quote

You can find excellent, used OEM German made dog house fan shrouds for $40 dollars. There's tons out there.

Sadly, most "new" parts are nowhere close to the original parts quality.
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mark tucker
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PostPosted: Sun Nov 18, 2018 12:17 am    Post subject: Re: Scat fan shroud with heat Reply with quote

I think I removed mine or squezed them a lot closer togeather so the heads get better flow....or not.
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Kiwi1966
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PostPosted: Thu Nov 22, 2018 2:19 am    Post subject: Re: Scat fan shroud with heat Reply with quote

Thanks for the replys- a couple more questions re the scat and oem shrouds I have.In the photos below the scat has a diffent style arrangement to the oem in regards to the finning that directs air to the oil cooler.From what I have found when searching the scat has a positive pressure style and the oem has a negetive pressure style.Not sure what this means - can anybody explain and in the last photo a small outlet comes off the oem shroud, what was this used for
Thanks Ross
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FeelthySanchez
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PostPosted: Thu Nov 22, 2018 9:02 am    Post subject: Re: Scat fan shroud with heat Reply with quote

Ross,
The small outlet is part of the evaporation control system. It leads to the charcoal canister, which needs pressure to function:

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Kiwi1966
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PostPosted: Sat Nov 24, 2018 3:24 am    Post subject: Re: Scat fan shroud with heat Reply with quote

Thanks for that , anybody have any idea re the positive and negetive pressure differences in the two shrouds
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AlteWagen
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PostPosted: Sat Nov 24, 2018 9:05 am    Post subject: Re: Scat fan shroud with heat Reply with quote

Kiwi1966 wrote:
Thanks for that , anybody have any idea re the positive and negetive pressure differences in the two shrouds


In 1971 the type II was still running the type I engine and needed additional cooling air directed to the oil cooler thus the 'positive' scoop was created (same as most aftermarket shrouds including scat). The type 181 also used this scoop on some applications as well.

The famous Jake Raby did some testing and found there was a slight increase in head temps on the #1 cylinder as the positive scoop directed cooling air away to the cooler. I believe VW also realized this causing the next evolution which was the peanut port starting in 1975 with FI. In combination with a fan venturi they were able to control the higher operating temps that emission tune would cause.

Not sure of any pressure differences when using positive vs negative, I think pressures are affected more by fan size, and how much factory tin is used. The fan venturi ring smooths out incoming air but not sure its affect on pressure.
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Kiwi1966
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PostPosted: Sat Nov 24, 2018 1:14 pm    Post subject: Re: Scat fan shroud with heat Reply with quote

Thanks Altewagen for your informative reply
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