Random thoughts thread

[serialk11r]

Originally Posted by Dimman

Toluene. Weapon of choice during the retarded psi turbo F1 days. 1000 hp/L in qualifying trim...

You're forgetting the restrictor With an equal size restrictor, methanol is the best choice. They've taken that into account though, you're allowed to use a 100 octane straight gasoline, or E85 but with a 19mm restrictor rather than 20mm.

FSAE is called Formula for a reason you know

EDIT: Random thought: just nicknamed my car "spyda" (for now), after the random kid who walked past my car and went "[whistle] woo! SPYDA!"

[wrxgoose]

Originally Posted by jstans84

Dude how can you watch that when Dinosaurs is on Netflix now?!?

got that in my queue, watching it after i finish JCA

[Dimman]

Originally Posted by serialk11r

You're forgetting the restrictor With an equal size restrictor, methanol is the best choice. They've taken that into account though, you're allowed to use a 100 octane straight gasoline, or E85 but with a 19mm restrictor rather than 20mm.

FSAE is called Formula for a reason you know

EDIT: Random thought: just nicknamed my car "spyda" (for now), after the random kid who walked past my car and went "[whistle] woo! SPYDA!"

20mm? That's tiny. What are some of the power numbers they're getting out of them?

[shadoquad]

Originally Posted by jstans84

Dude how can you watch that when Dinosaurs is on Netflix now?!?

Oh

my

God

You, sir, have just stolen next weekend from me.

[Calum]

Originally Posted by Dimman

20mm? That's tiny. What are some of the power numbers they're getting out of them?

Well, I'm not an engine nerd in the sense that I have the education that you guys do, but I'm still very interested and follow along with most of the conversions, asking questions when I don't know something. I did a small amount of reading and found a guy on honda tech talking about making almost 90 hp with a similar sized engine and restrictor. FUCKING CRAZY

Then I got to thinking about just how small a 20mm restrictor is so I measured the inlet to my chainsaws carburetor and it's 1.84 cuin engine. Yup, 19.6 mm.

@serialk11r have they done anything to move peak power down? I know you said the cams are OEM, but there's also intake manifold tuning and cam phasing..?

[M-17]

So far I've had a successful trip here Chicago. Must say IMTS is pretty sick too.

[ichitaka05]

Not feeling good at all... & stuck at freezing cold work isn't helping

[serialk11r]

Originally Posted by Dimman

20mm? That's tiny. What are some of the power numbers they're getting out of them?

Our school is getting a bit under 90hp I think but they haven't bothered to change cams, which is sorta hurting them. They say that the 20mm restrictor gives a practical limit of about 100hp.
@Calum there's no cam phasing on bikes lol. One of the ideas one of the guys had was to retard the intake cam one tooth to see if the reduced overlap would help. They ended up not doing that since they had no time to test it.

[Dimman]

Originally Posted by serialk11r

Our school is getting a bit under 90hp I think but they haven't bothered to change cams, which is sorta hurting them. They say that the 20mm restrictor gives a practical limit of about 100hp.
@Calum there's no cam phasing on bikes lol. One of the ideas one of the guys had was to retard the intake cam one tooth to see if the reduced overlap would help. They ended up not doing that since they had no time to test it.

I think Calum meant manually phasing the cams with adjustable sprockets.

Dropping a whole tooth? They don't have machine shop time or access to make or slot sprockets or make offset keys?

[serialk11r]

Originally Posted by Dimman

I think Calum meant manually phasing the cams with adjustable sprockets.

Dropping a whole tooth? They don't have machine shop time or access to make or slot sprockets or make offset keys?

They didn't have time to drop a whole tooth and test it, much less time to make an adjustable sprocket.

While a whole tooth is quite a bit these bike cams have a lot of overlap so a whole tooth (being like, what, 10-20 degrees timing?) might actually be just what it needs, iono.

http://fsae.com/eve/forums/a/tpc/f/1.../m/34920486151

While no one knows what those specs actually mean, 20 degrees BTDC is a lot! If effective valve opening is right at TDC, that would cut overlap down and work much better with a restrictor. Not to mention, the reduced VE would slightly improve thermal efficiency, which is what counts the most when you're oxygen limited.

[Dimman]

Originally Posted by serialk11r

They didn't have time to drop a whole tooth and test it, much less time to make an adjustable sprocket.

While a whole tooth is quite a bit these bike cams have a lot of overlap so a whole tooth (being like, what, 10-20 degrees timing?) might actually be just what it needs, iono.

http://fsae.com/eve/forums/a/tpc/f/1.../m/34920486151

While no one knows what those specs actually mean, 20 degrees BTDC is a lot! If effective valve opening is right at TDC, that would cut overlap down and work much better with a restrictor. Not to mention, the reduced VE would slightly improve thermal efficiency, which is what counts the most when you're oxygen limited.

What is the timeframe? One school year?

[Calum]

67!!! degrees of overlap, wow, now I understand wanting to a full tooth.

Yeah, as Dimman said, I was thinking of manually phasing the cams, grinding the keyway for a few degrees, or re drilling/slotting the locator pin hole that sort of thing.

With those conditions, I'm actually surprised they didn't just drop the intake back the full tooth and run it anyway. But I'm way out of my league so I'll go back to lurking.

[boucher]

Are internet memes becoming too popular and overused?

[wrxgoose]

some of them. we need more Zoidberg though.

(V) (;,, (V)