Mythbuster: continuing project thread of my 1303 '75

[Wally]

Originally Posted by volkdent

That is just awesome!!! I love your torque/power curve, looks like a lot of fun. Congrats on all your hard work over the years, I'll always give you a hard time when things let go, but in the end you've worked diligently to prove the relative reliability with big air-cooled power on a controlled budget. Hats off here!

Jason

Thanks Jason!
But I must comment on the "relative reliability" part
If you referring to the broken rockers, they were just a tuning fault of mine running the engine into overboost and getting hard fuel cut-outs and associated backfires.. The funny part is just that a lot of ancillaries have gotten damage (bend throttle plates, burst boost lines, two broken rockers) due to the boost-cut-outs but the long block is still solid as a rock.
The basic concept of this type of engine has proven itself beyond doubt.
Furthermore, I ran the 350 hp tune over half an hour mostly WOT, full-on at a race track (Zandvoort). I did the same doing 8 laps of 10 minutes per lap (21 km's each lap) on the Nurbürgring last month and your calling this 'relative reliability'? Come on man, just admit I totally detroyed your reason for running a watercooled engine alltogether

But I love you too and truely appreciate your craftsmanship on your car

Its totally amazing that the 103 cast-alu bored Mahle-Oettinger cylinders held up as much as they did, while we all know that a smaller bore would have been much better.
Stock case, stock heads, stock crank and stock rods. "relative reliability'...pfft please! Aircooled FTW!

[70Turbobug]

Very impressive Wally!! As said many times before,the evolution of your car is phenomenal!
I don´t think it will be long before we see 400HP!! Were the bent throttleplates in the Jenvey TB?

[Wally]

Thanks; I think I could have gotten the 400 with a little more agressive tuning, but the current map is very safe and good enough then

Yep, they were from the Jenvey TB's. Not the Jenveys fault I must add

I also bleeded some air from the Hurst line lock which made a pleasent difference on the drive to the dyno especially since I am trying out the ceramic front disks again:

[volkdent]

Originally Posted by Wally

Thanks Jason!
But I must comment on the "relative reliability" part
If you referring to the broken rockers, they were just a tuning fault of mine running the engine into overboost and getting hard fuel cut-outs and associated backfires.. The funny part is just that a lot of ancillaries have gotten damage (bend throttle plates, burst boost lines, two broken rockers) due to the boost-cut-outs but the long block is still solid as a rock.
The basic concept of this type of engine has proven itself beyond doubt.
Furthermore, I ran the 350 hp tune over half an hour mostly WOT, full-on at a race track (Zandvoort). I did the same doing 8 laps of 10 minutes per lap (21 km's each lap) on the Nurbürgring last month and your calling this 'relative reliability'? Come on man, just admit I totally detroyed your reason for running a watercooled engine alltogether

But I love you too and truely appreciate your craftsmanship on your car

Its totally amazing that the 103 cast-alu bored Mahle-Oettinger cylinders held up as much as they did, while we all know that a smaller bore would have been much better.
Stock case, stock heads, stock crank and stock rods. "relative reliability'...pfft please! Aircooled FTW!

By "relative" I only mean that 100k Km from now if you've continued to have no major issues I'll be flying over to have a pint with you! It's super reliable, just not sure it's super reliable compared to modern engines. I'm not worried at all about running 350hp for 60k miles on a modern h20 cooled car, it's reliability over time that garnishes the "relative" comment. When that myth is busted (notice I'm giving you the benefit of the doubt!) I really think you need to write down all the things you've don, settings you use, and parts you've used because to me it seems like the perfect combination. Wish I had the skill and knowledge to be able to pull off what you did. Especially when it ends up sounding so awesome on the track!

Jason

[Wally]

Hehe
60K miles or km's driving on the road using the car as a daily is totally meaningless for the engine with regard to stress and load imho. Its the track driving at mostly WOT and/or full boost what counts.
I think I put more stress on my bug's engine during the 5K or so I drive it per year then I do on my Passat that I drive 30K per year...

But I am also sure, I don't ever convince you right?
Which is just as well probably, as I don't have anything to sell

[volkdent]

Originally Posted by Wally

But I am also sure, I don't ever convince you right?
Which is just as well probably, as I don't have anything to sell

I love it!!! Well let me tell you, after all the good things that have come out of your engine storys, you are making a very good sale, so maybe you should sell something. I wouldn't have thought about doing an aircooled again until you've shared your experiences with us. Even spending more on some more sturdy parts would still net a lot of power for the money. If I ever got another car I didn't want to cut up I would seriously consider copying your setup.

Thanks again.

Jason

[Wally]

Thanks for the props Jason! really!

Some vids of the last (Nurburg)Ring outing (16th april), tnx to John, the 'CNCwizzard' and Robin aka 'Blue thunder':

http://www.youtube.com/watch?v=TF2gL_LlP7Y

http://www.youtube.com/watch?v=hc7ezxzMDs4

Lots of pics from then too from the Adenauer Forst turn:



Cam from Aussie-land contemplating if he should...:-)

[johnnyvee]

sic