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View Poll Results: Shrouds are a good idea and should be replaced.
Yes, replace the shrouds. 13 100.00%
No, you don't need them... 0 0%
Voters: 13. You may not vote on this poll

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Old 11-06-2012, 12:45 AM
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mccutter mccutter is offline
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Question B&S 20hp Cooling Shrouds: Yes or No?

I have an MTD "project" mower I'm getting ready for next spring. It has a Briggs & Stratton horizonally-opposed, flat-head, 20hp, "TWIN II" engine. The engine is missing some of the cooling shrouds that were originally installed. There is a set on Ebay for $28--do you think they are essential? I am thinking they are good for cooling (while sitting still) and sound dampening. What do you think?
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Old 11-06-2012, 01:09 AM
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LKeithR LKeithR is offline there a prize?
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Pretty sure that the shrouds will aid in cooling the engine but I really doubt you'd kill it without them. You could probably get away without them but for that kind of money why not throw a set on?

Measure twice and cut once...or...wait, was that the other way around?
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Old 11-06-2012, 04:33 AM
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RED caddy RED caddy is offline
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For my money, I'd run the shrouds. They do help with cooling and keep cut grass and such from packing up in the cooling fins. The down airflow is directed over the cylinder fins, by the head covers, instead of over your feet/legs.

I'm right in the middle of a "rattle can" overhual on the twin to yours. Pay close attention to valve adjustment, it's more critical than the tin...

A 160 MPH drive, down a 2 lane blacktop, all by yourself, is NOT anti-social behaviour... I drag race because football, baseball, and golf only need ONE ball. Paul.

What I really need to know is, WHEN DOES THE SHOOTING START?
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Old 11-06-2012, 07:05 AM
bunkclimber bunkclimber is offline
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You may be OK not running them for a short run(racing?),but B+S put them on there to direct the air down across the head to balance the cooling effect of the fan air across the head.You may get a hot spot on the head from the cooling air wafting away halfway across the head due to wind or forward motion of the tractor-leaving the bottom side of the head(and head gasket)with a hot spot which may ultimately lead to head gasket failure.For my money,why not make up some shrouds from sheet metal? Can't be that hard to do..better than running nothing at all

Originally Posted by mccutter View Post
I am thinking they are good for cooling (while sitting still) and sound dampening. What do you think?
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Old 11-06-2012, 07:47 AM
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Scrapper Greg Scrapper Greg is offline
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Shrouds are needed. even without the grass clippings, without the shrouds, you will run into heat related issues.
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Old 11-06-2012, 08:12 AM
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Dr Dean Dr Dean is offline
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Yes you want the shrouds they direct airflow to keep the cylinder cool. I saw the aftermath of one that was missing some, it wasn't pretty.
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Old 11-06-2012, 08:36 AM
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I tell my small engines students that leaving the shrouds off of the engine is like standing in front of a fan without its blades on. Not a lot of cooling going on in either scenario.
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Old 11-06-2012, 08:45 AM
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The problem is there is no temp gage.

Put the baffles on.
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Old 11-06-2012, 02:20 PM
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rmack898 rmack898 is offline
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+1 to what everyone else has said. You need the shrouds.
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