Tommy

Goodfellas Project

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Some slow progress. After 20 hours work the brake center hubs look quite good. Actually I was surprised that I was able to do it all by myself. Head came from machineshop with new valve seats installed on the intake side and Schrick 48/39 valves fitted. I already test assembled cyl #1 and checked the clearances - everything seems ok.

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What kind of spark plugs are you running and what gap do you set them at?

also what is your spark advance? I heard 34-36 at 4000rpm

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What kind of spark plugs are you running and what gap do you set them at?

also what is your spark advance? I heard 34-36 at 4000rpm

I've been running NGK PB8ES. I think in US they use different markings? Anyway it's like standard but 2 steps cooler. With Crane cam HI-6 system I've opened the gap to about 0,8...0,9 mm, but I really haven't noticed any difference in performace whether it's 0,6 or 0,9.

Now I'm going to KMS wasted spark DIS ignition and I'll try Brisk LGS plugs http://www.briskusa.com/ One reason for that is that the 48mm inlet valve would interfere with the electrode of normal plug if the plug is not tightened to right angle.

Yes that's about the advance that is recommended for these kind of engines. I have had about 36 degrees maximum and it's reached around 4500. It was set at dyno by listening the detonation (or knocking or pinging or whatever the correct english word is?).

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Tommy

Who makes/supplies the cam sprocket in the pic above?

DB

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That's own design and custom made. I used std wheel that is turned backwards. It's modified in lathe and there is 6 oval holes made in milling machine. Center piece is made of aluminum.

Tommy

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Yes I've seen Gustave's pictures. They are the best I've found from internet. There's surpricingly few pics of guillotine throttles available!

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Slowly going on. Slide throttle has progressed to the point that I have mechanically working system on my table. Still missing manifold because of problems in laser cutting thicker aluminum.

At least it looks quite nice. No guarantee that it will ever work.

Engine block is assembled and head is assembled but they are not put together yet. I also should receive the ECU + sensors in few days.

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Tommy, those look awesome. Should get some nice torque with those long velocity stacks. Love the car, very cool to watch your progress.

--Rick

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nice work!! I like the trumpets, where did you get them?

I'm sure it will work out quite nicely. I have raced 3 motorcycles with slide throttles.... I did not notice that much difference in usuabilty from butterfly style...there was an increse in power...

keep posting pics as you progress!!

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Thanks guys! I got the trumpets from http://www.sarlinraceteam.fi/ They are nearby and they have all kind of nice stuff like Alcon brakes etc. They have had the trumpets made by some local shop.

Kalle Sarlin's own racecar is worth seeing. It's made of aluminum composite honeycomb all 3D-designed. Some INDY formula gearbox, Cosworth 4-cyl turbo engine, Ford Escort roof and outlines... (links "auto" and "kuvia" on the page are interesting at least)

Yesterday I got KMS injection ECU + wasted spark coil and sensors (TPS, IAT, CLT, crank position) so next I will be mounting them.

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I bought a 318i L-Jet manifold and cut the flange part off. I will use the flange so I have places for injectors and fuel rail correctly positioned. Well I broke one of the fuel rail mounts off while grinding but one is still there. I fitted it to head and then I made the runners to be welded on. They were first turned to conical shape and then pressed oval. Still missing flange to mount the slides.

The port (or runner or whatever the correct word is) is evenly getting narrower all the time so the air should be in accelerating motion resulting high flow speed and good fill in cylinder - in theory ;-) Total length from trumpet opening to valve is now approx. 35 cm but I may have to shorten the stacks if they don't fit in the engine room.

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wow! looking great! can wait to see final mounting and dyno results!

keep it up! amazing!

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just one note: ( i know it's to late to change but........)

How did you arraive at your injector placement? Seams very close to combustion chamber....not seen that before.

I know it has a big effect on power.

The new ducati 999 motor places the injector in front of the trumpets. They call it "shower style" injector. Aparently something to do whith proper "atomization" of the mixture. I know that ducati did gain power over prvious year design.

"Why spray way out there?

Spraying upstream of the air inlet allows the sprayed fuel more time to evaporate for better burning and by evaporating, it also significantly cools the intake air, making the air denser - therefore, more power.

As much as 2% to 3% better is some cases."

Cooling the air sounds like an intresting theory....

also

aparently the new Yamaha 4cylinder 600cc (R6) engine has also adopted shower-type injectors above each intake funnel to help achieve perfect fuel atomization at high rpm.

so maybe the difference appears at high rpm fuel atomization?

shown below

Ducati999R05Engine.jpg

also I have seen a toyota atlantic formula motor with simliar design of which I attached pictures.

I realize this might be a bit ambicious of a design....but I figured I bring it up! for discussion... since you ar making it......you can place whereever you want.....

If not that, what about bringing the injectors farther up close to the top of the trumpets? I remember I'v seen many m10 formula motors. And many other race motors even lemans V8's. Dave Mcyintire place his injectors BEFORE his slide trottle plates. Look at pics of schinitzer slidetrottle engine I attached below and see where they spraying fuel...right at the top! I imagine they almost did what toyota and ducati are doing today with shower style.

I also know s14 DTM engine also ran 2 injectors per runner (8total). Have you tought of this? What are the advantages of this ?

On the other hand, I heard BMW (I think) is developing a motor where the injector sprays directly into the combustion chamber! alongside the sparkplug so who know what is best really...........

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here is a good picture of ferrari F1 engine injectors.....so maybe this is the best way to do this?...

doesn't look to hard to fabricate........look at toyota engine I posted above they just use a bent metal rod to hold fuelrail/injectors...

like I said more complicated, sure but better? seams that way.....

fer10.jpg

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Yes I have thought of that. I didn't like the idea of spraying the fuel against the slide. Then it would go everywhere inside the casing, there's bearings etc. It would have been the easiest way to mount the injectors. Well now that I figured out to use the L-Jet manifold it may be easier.

Main thing is that I have very limited access to machine tools etc. so I have to think about how make things simple. Also welding alu is a job I have to outsource. I have to compromize somewhere to make it happen.

Then yesterday I talked with one guru who's opinion was that it does not have much difference when revolutions are below 9000. Compare to F1 and bikes - so I think that's the reason that they run close to 20krpm, the fuel really needs the extra time to vaporize.

Bad thing was that he calculated that the runners should be about 400 mm tall to gain some more advantage from resonanses. 350mm gave the resonance frequency (third harmonic) somewhere at about 9400rpm, 400mm would bring it to 8200rpm.

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