Mythbuster: continuing project thread of my 1303 '75

[TSAF]

Wally I told you in the past that since you are a pioneer in type4 turbocharged engines you should do it professionally. Nice work by the way.

[70Turbobug]

There´s no money in it really if you consider the time and hassle involved with parts.The only way to go is to make as many parts as you can yourself which requires a whole park of expensive machines and tools.Nowadays that´s the only way you can stay in business and build quality engines.Also 80% of the aircooled community are cheap and are not willing to pay the price for quality custom made parts.An engine like Wally´s would have to sell for about 10-15K at least in order to be able to live off of it owning a business.

[Wally]

Originally Posted by TSAF

...you should do it professionally.

Thanks for the complement, but I like it better as a hobby. I also have more joy in the tuning of engines then building them tbh.
EFI tuning engines would be a fun job though ;-)

I have a wild idea to try out next season BTW :-)

[Wally]

Some new ingredients to better chase the Race-taxi at Spa this year

[NO_H2O]

Sweet. Grip is good.

[70Turbobug]

Nice! Toyo R888? How's the engine coming along?

[judgie]

i had good fun trying to chase the race taxi round lydden hill a few weeks ago.

[ricola]

Surely you will be faster than the race taxi Wally?!

[Wally]

Originally Posted by ricola

Surely you will be faster than the race taxi Wally?!

I doubt that very much. He's ace at taking corners. I have much less confidence. Hopefully the new tire will help some with confidence

Engine long block is sort of ready Mark, shroud is 'fixed' again


Flywheel and clutch are finally ready too, so hopefully hang the block in the car this WE

[70Turbobug]

I love that clutch! Do you have a hydraulic throw-out bearing? Looks like you´ll be back on the road soon! It will be interessting to see how all these new mods will perform!

[effvee]

Originally Posted by Wally

Cheers!

In the meantime, I started on the revamp of the 2,2 engine beginning with the new central cooling lay-out:

Walter, why the change in shrouds? I thought you liked the horizontal setup better. Was there a difference in CFM of the two?

[70Turbobug]

I would say the fan belt is one reason...

[Wally]

Originally Posted by effvee

Walter, why the change in shrouds? I thought you liked the horizontal setup better. Was there a difference in CFM of the two?

Yes, I like the horizontal set-up A LOT! However, at very high RPM, it doesn't always stay on when the ecu activates the Rev-cut or fuel-cut.
It has shown to be good for 7700 RPM easy, but not combined with sudden soft- or hard-cuts in the ignition.

Air distribution is naturally very good with the horizontal set-up, but with the arrival of this centrally positioned cooling system from MSS with his shroud, I think there is a better chance cooling will be close to evenly spread with this one as well.

CFM (total air moved) is dependant on a lot of other things. Pulley size has a huge part there and the Riechert pulley is much larger (172mm?) then the vertical set-ups (most are 145mm as is this one, also to clear the DS pump), so you know which one will move more air...

Also the fans are different. 12 blade fans displace less air then the older 11-blades, so thats different as well.
Your question about CU.ft/min sort of suggests that more CFM cools better, which is still questionable. Lots of variables.

So, ...my track use with very high rpm with lots of iginition cuts more or less lead me to a vertical set-up again, but I think only by actually using the system and seeing what it does or doen not do on a certain engine, can give an idea of how well something works.

[judgie]

I think only by actually using the system and seeing what it does or does not do on a certain engine, can give an idea of how well something works.

I think thats the best bit of advice i have seen on any forum.
looking good.

[spannermanager]

Originally Posted by Wally

. but I think only by actually using the system and seeing what it does or doen not do on a certain engine, can give an idea of how well something works.

X Two for that, ive come across cases where the motor was overcooled and needed the smaller pulleys to bring it back into 'the zone', and it picked up A LOT of power.