Custom fan Shroud .

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bj
Posts: 1150
Joined: Sat Feb 08, 2003 3:01 am

Re: Custom fan Shroud .

Post by bj » Thu Dec 21, 2017 12:11 pm

when are you going to sell these ;-)

looking forward to seeing your progress...the CHTs look VERY promising!

Happy Holidays!

BJ

wreck
Posts: 211
Joined: Thu Aug 14, 2014 2:07 am
Location: Brisbane Australia

Re: Custom fan Shroud .

Post by wreck » Fri Dec 22, 2017 3:43 am

Hi BJ

I may produce a few kits but it won't be for a while ,maybe later part of next year. I'm really time poor at the moment and am making plugs and moulds for a single airbox filter system plus setting up a Megajolt ignition, fitting AC and a serpentine belt system .

I've been driving the car daily and am happy with how cool the temps run , #1 runs the hottest at an average of 120C ,#2 is the coolest at 105C .(the thermocouple is bonded to the plug boss so the readings are slightly lower than under the plug ). #1 stub pipe has a larger dent in it to clear the pushrod tubes . I wonder if it is causing the higher CHT . I'll straighten out the pipe(to match #4) early next year when I get the whole system ceramic coated .
Also the 48 Dells have a hole in the butterfly and I'm finding the idle mixture screws are very vague but adjusting them make a big difference to the CHT .so I'm going to block up the holes and see what that does .

For oil cooling I've 2 coolers either side of the gearbox with properly shrouded fans with a Mocal sandwich thermostat . the oil temps rises up to 90C then the fans kit in and regulate the temp straight back at an average 80C or so . All this in humid 30C ambient temps .

I wonder how many big bore/stroke high comp type 1's run that cool :-) . I'll try and get a video up in the next week or so of the gauges/temps etc .
No matter where you go , there you are !

User avatar
bj
Posts: 1150
Joined: Sat Feb 08, 2003 3:01 am

Re: Custom fan Shroud .

Post by bj » Wed Dec 27, 2017 10:55 pm

wreck wrote:
Fri Dec 22, 2017 3:43 am
Hi BJ

I may produce a few kits but it won't be for a while ,maybe later part of next year. I'm really time poor at the moment and am making plugs and moulds for a single airbox filter system plus setting up a Megajolt ignition, fitting AC and a serpentine belt system .

I've been driving the car daily and am happy with how cool the temps run , #1 runs the hottest at an average of 120C ,#2 is the coolest at 105C .(the thermocouple is bonded to the plug boss so the readings are slightly lower than under the plug ). #1 stub pipe has a larger dent in it to clear the pushrod tubes . I wonder if it is causing the higher CHT . I'll straighten out the pipe(to match #4) early next year when I get the whole system ceramic coated .
Also the 48 Dells have a hole in the butterfly and I'm finding the idle mixture screws are very vague but adjusting them make a big difference to the CHT .so I'm going to block up the holes and see what that does .

For oil cooling I've 2 coolers either side of the gearbox with properly shrouded fans with a Mocal sandwich thermostat . the oil temps rises up to 90C then the fans kit in and regulate the temp straight back at an average 80C or so . All this in humid 30C ambient temps .

I wonder how many big bore/stroke high comp type 1's run that cool :-) . I'll try and get a video up in the next week or so of the gauges/temps etc .
trust me...i understand "time poor" for sure! keep plugging away!! my car has been sitting for 10 years. i've been working on it that long! soon though..soon...

thanks for the info and the innovation!

BJ

wreck
Posts: 211
Joined: Thu Aug 14, 2014 2:07 am
Location: Brisbane Australia

Re: Custom fan Shroud .

Post by wreck » Sat Feb 24, 2018 7:14 pm

Still trying to get the head temps more even on the right side , about 15C lower on #2 , #1 and #4 are dead even and #3 about 5C hotter . I think it's related to the shroud shape favouring the colder cylinders so next step is to modify the shroud . Running with the belt off the temps are even so I know my CHT readings are accurate and the engine has no issues . cranking compression of 130psi on all four .(310 degree cam)

I went for a 50k drive on a +35C humid day 2 weeks ago and the CHT's only reached 135C in stop start traffic and stabilised at 120C at 3500rpm in top gear at 100km/h . that was running a lower fan drive ratio than standard (same as a power pulley) . So very happy with that .
No matter where you go , there you are !

E_bug
Posts: 260
Joined: Tue Dec 29, 2009 2:05 am
Location: Athens Greece

Re: Custom fan Shroud .

Post by E_bug » Fri Apr 13, 2018 2:44 pm

Very nice build ! I like the oil squirter setup.
My welding sucks .

Mave
Posts: 22
Joined: Thu Jul 18, 2013 1:25 pm

Re: Custom fan Shroud .

Post by Mave » Tue Aug 07, 2018 3:50 pm

Looking great so far. Are there any updates on the shroud design? Would also love to see your take on the airbox design!

Marcel

wreck
Posts: 211
Joined: Thu Aug 14, 2014 2:07 am
Location: Brisbane Australia

Re: Custom fan Shroud .

Post by wreck » Tue Aug 07, 2018 4:52 pm

air box 1.jpg
airbox 2.jpg
I spent a long time trying to get an air box to flow enough ,the engine is making about 170 whp , it would get restricted over 1/2 throttle . I doubled the air filter panel size but still no good .

The shroud needs a little tweeting on the #1 #2 side , they run about 15C apart , #3 #4 run within 5C of each other . On a 30C day the CHT on cruze at 3400rpm is 110c to 125C across the 4 cylinders . measured at the spark plug boss .(thermocouple is JB welded to the head) that is with standard Type 1 fan ratio .
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No matter where you go , there you are !

H2OSB
Posts: 541
Joined: Mon Aug 21, 2000 2:01 am

Re: Custom fan Shroud .

Post by H2OSB » Wed Aug 08, 2018 4:07 pm

Love the airbox! I want one of those very much...eventually.

H2OSB

Mave
Posts: 22
Joined: Thu Jul 18, 2013 1:25 pm

Re: Custom fan Shroud .

Post by Mave » Sat Aug 11, 2018 2:21 pm

Nice. Great to see how you make these yourself, and are working on improving their functionality. Keep us updated!

Marcel

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