Custom fan Shroud .

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wreck
Posts: 296
Joined: Thu Aug 14, 2014 2:07 am

Re: Custom fan Shroud .

Post by wreck » Sat Aug 17, 2019 10:18 pm

I made another shroud with changes to the #1 #2 side but didn't get the results I wanted . still about a 15-20C temp difference . :( . Also still didn't get the fan clearance right . I modified it to get fan clearance and have a bit more clearance than my other shroud . The funny thing is it gives a distinct almost blower type whine that the other shroud doesn't . I'll leave the R&D on the shroud for now , One I don't like working with fibreglass it's a PITA to work with and I don't know if the temp difference is just something with this engine ,even though the compressions are even . If I had cheap dyno excess I'd run it up without the belt and see what the difference is with load .
FullSizeRender-7.jpg
I moved on to trying to make the car nicer to drive , the exhaust has always droned and been loud and after an hour on the freeway is not nice . Since I couldn't buy a muffler to fit where I wanted to put one ,I decided to have a go at making one . Pretty happy with the results. I'll make another one for the other side but with just straight tube .
custom muffler 1.JPG
custom muffler 2.JPG
custom muffler .JPG
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patto
Posts: 30
Joined: Tue May 11, 2010 7:13 pm

Re: Custom fan Shroud .

Post by patto » Sun Aug 18, 2019 4:56 am

great work Wreck! interested to know how many decibels you have reduced with your own muffler? its always hard balance to get right with limited supply of exhaust parts for the Type 4. Ill no doubt build my own also.

andy198712
Posts: 2165
Joined: Wed Apr 13, 2011 3:01 pm

Re: Custom fan Shroud .

Post by andy198712 » Sun Aug 18, 2019 5:22 am

have you tried removing the belt and starting it up and monitoring temps?

great project!

wreck
Posts: 296
Joined: Thu Aug 14, 2014 2:07 am

Re: Custom fan Shroud .

Post by wreck » Sun Aug 18, 2019 5:53 am

The DIY muffler replaced the little resonator in the pic ,it's fibreglass packing had burnt away . It was quieter but still droned , I removed the big triflow muffler and fitted a resonator , that has removed a lot of the drone ,I plan to make a straight through muffler and then a resonator running behind the engine with the exhaust tip in the centre near the collector . It's 2 1/2 inch system .
Gabbi underneath . .jpg
I have let the car idle without a belt and the temps are still different , I'd like to run it under constant load off the idle circuit . With 4 CHT's you can really see how much idle mixture and carby balance plays with head temps ,even when driving . I know the thermocouples/gauge is accurate because after running turning off and checking the temps 10 5 minutes later they are even .
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wreck
Posts: 296
Joined: Thu Aug 14, 2014 2:07 am

Re: Custom fan Shroud .

Post by wreck » Tue Dec 24, 2019 5:33 pm

Merry Christmas Forum Folks , I wish you a safe and merry Christmas and fantastic New Year .
an update on the custom shroud .
I made a small concave shape change to the back (#1) section of the shroud causing the airflow to move more to #1 cylinder added a small vane and now have what I was hoping for . All 4 cylinders with in 10C all the time . Most of the time they are with in 5C of each other .
The picture is the CHT's after a 14km 30 minute peak hour commute in 30C ambient temps . The thermocouples are attached to the spark plug boss in the heads .
Not bad for an air-cooled engine with over 200 flywheel HP .

https://youtu.be/9cYrZ37L63s
CHT shroud #3.jpg
. (may not work till 26/12 .)

This shroud would be easy to use in a Joe Cali style conversion and may be made available to buy either by itself or with the cylinder covers depending on demand .
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patto
Posts: 30
Joined: Tue May 11, 2010 7:13 pm

Re: Custom fan Shroud .

Post by patto » Tue Dec 24, 2019 6:09 pm

Great work mate!

I couldn't get the link to work though? it says its private

patto
Posts: 30
Joined: Tue May 11, 2010 7:13 pm

Re: Custom fan Shroud .

Post by patto » Wed Dec 25, 2019 8:15 pm

Just watched the link! 170hp at the wheels and over 400nm of torque. That is impressive to say the least.

H2OSB
Posts: 663
Joined: Mon Aug 21, 2000 2:01 am

Re: Custom fan Shroud .

Post by H2OSB » Wed Dec 25, 2019 8:32 pm

Can you give a possible price point. I might be interested in two(potentially)

H2OSB

wreck
Posts: 296
Joined: Thu Aug 14, 2014 2:07 am

Re: Custom fan Shroud .

Post by wreck » Wed Dec 25, 2019 11:53 pm

I'll have to work out the cost of manufacturing the shroud and tins with Megamanx who's day job is working with composites and go from there .
No matter where you go , there you are !

H2OSB
Posts: 663
Joined: Mon Aug 21, 2000 2:01 am

Re: Custom fan Shroud .

Post by H2OSB » Thu Dec 26, 2019 12:15 am

That's good enough for now. Just know I'm interested.

Thanks
H2OSB

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Clatter
Posts: 1797
Joined: Sun Apr 28, 2002 3:01 am

Re: Custom fan Shroud .

Post by Clatter » Thu Jan 02, 2020 8:05 pm

I'd take one too..
What's that Noise??

Beginners' how-to Type 4 build thread ---> viewtopic.php?f=1&t=145853

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barls80
Posts: 36
Joined: Wed Oct 20, 2004 3:35 am

Re: Custom fan Shroud .

Post by barls80 » Tue Jan 14, 2020 9:21 am

I’d be interested as well for my 2L t4


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actionj
Posts: 3
Joined: Wed Mar 20, 2013 12:01 am

Re: Custom fan Shroud .

Post by actionj » Sun Jan 19, 2020 7:19 pm

I’m interested as well!


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wreck
Posts: 296
Joined: Thu Aug 14, 2014 2:07 am

Re: Custom fan Shroud .

Post by wreck » Mon Jan 20, 2020 3:13 am

Sorry guys it will be a little while , day jobs are getting in the way of hobbies !! But you all will be first on the list .
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