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Kudos To Doc Dodge (Doug Dutra)!!!!!
https://www.slantsix.org/forum/viewtopic.php?t=43120		 Page 2 of 3
Author:  Doc [ Fri Jan 07, 2011 12:07 pm ]
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Keep posting your observation to this thread... doing that helps everyone.
Little comments like: "It did have a *little* pinging under light freeway acceleration - I put in premium gas, and the pinging is now gone..." tells us a lot. A little vacuum advance "pod" adjusting may-be needed.

It does sound like we have this combo close to that "edge" of compression, cam & ignition timing, for pump fuel.
This is where you want to be for a great running street application.
DD
Author:  slantfin [ Fri Jan 07, 2011 12:34 pm ]
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Does that rev so quick because of the distributor springs, or is it something else?
Author:  Fab64 [ Fri Jan 07, 2011 12:44 pm ]
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Have you checked your gas mileage yet? Just curious what it is, thanks.

Roger
Author:  olafla [ Fri Jan 07, 2011 3:24 pm ]
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Quote:
I'm such a dummy sometimes!
Nope.

Olaf.
Author:  63Dart [ Sat Jan 08, 2011 12:19 am ]
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Cool - well I can also tell everyone that the "two choke" system you set up makes the car start like it has fuel injection out here in the cold - no problem starting it even in sub-freezing temps. . .

I recommend that anyone who uses the old offy two carb manifold do this - it works amazingly well!!!!!

Not sure of mileage yet - didn't want to measure it until the motor is a little more broken in - I remember whenever I've put a new motor in any car I've owned - the initial mileage was not as good as it became later.

There's a tiny bit of hesitation - interestingly - when the chokes are *totally* closed - the engine is more responsive than when they open up - it's possible that I might need to adjust the accelerator pump linkage up one notch to give it a bit more fuel. Interestingly, sometimes moving it the other way works too. Since I don't know much about this kind of stuff - I just experiment sometimes!!!!

Based on what Doc told me, when I picked up the car - the previous slight pinging and current slight hesitation MAY be related - since you indicated that there's a relation between dynamic timing advance and hesitation sometimes.

One thing about this car I've always liked is when I park it and someone asks me "what kind of V-8" I have. I just LOVE showing them the motor and explaining that it probably puts out more HP now than the original V-8 motor did. Also sounds better, IMHO - I like the V-8 sound - but it's so common. . .

A good running inline 6 has a "ripping" sound that is just nasty - but in a good way.

:D
Quote:
Keep posting your observation to this thread... doing that helps everyone.
Little comments like: "It did have a *little* pinging under light freeway acceleration - I put in premium gas, and the pinging is now gone..." tells us a lot. A little vacuum advance "pod" adjusting may-be needed.

It does sound like we have this combo close to that "edge" of compression, cam & ignition timing, for pump fuel.
This is where you want to be for a great running street application.
DD
Author:  63Dart [ Sun Jan 09, 2011 5:03 am ]
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OK - adjusted the carbs to squirt more fuel into the engine when I press the gas pedal. The accelerator pumps on the old BBS' are easy to adjust - there's a little linkage thingie with three holes - I put mine on the lowest hole.

The slight hesitation is almost completely gone now. Next time I am in Bay Area, I may see if Doug wants to play with the distributor a bit. I'm not going to touch anything that I can screw up!!!!

Got more sense of the drivability today. Basically I was telling my wife that this engine makes at least as much power as many "less streetable" motors - but idles smoothly, starts up nice, and has power when I need it.

I'll stop gushing now, since Doug is probably blushing at this point. From now on, I'll just post the data!!!

:D
Author:  wjajr [ Sun Jan 09, 2011 6:42 am ]
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63Dart:
Quote:
I'll stop gushing now, since Doug is probably blushing at this point. From now on, I'll just post the data!!!
"Gushage" is welcome to one that has a less streetable cam in search of a better alternative. Doug’s RV 15 has got my attention. If only there were dynamometer numbers available for some of these popular cams, and builds, selecting a new stick would be an easer task.

Bill
Author:  Charrlie_S [ Sun Jan 09, 2011 6:53 am ]
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Quote:
If only there were dynamometer numbers available for some of these popular cams, and builds, selecting a new stick would be an easer task.

Bill
There you go, bill. Something to do in your spare time :D :D :D
Author:  63Dart [ Sun Jan 09, 2011 4:37 pm ]
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Yes - I'm actually looking to develop an "Android" app that will calculate rough horsepower and torque. This would be like the "GTech" (but obviously would not violate and patents or trademarks, etc.)

See my ad at: http://sfbay.craigslist.org/sfc/sof/2149655484.html

The idea would be that you could use a cheap $5 phone app to get a *rough* sense of whether something you just did to an engine made it faster or not.

Even if the app was not totally accurate - if different people compared the results using it on their car, one could still determine a baseline. . .

There are some apps out there that seem to do this - but they don't work in my phone, and I am guessing that the developers did not put a lot of money into creating them.
Quote:
63Dart:
Quote:
I'll stop gushing now, since Doug is probably blushing at this point. From now on, I'll just post the data!!!
"Gushage" is welcome to one that has a less streetable cam in search of a better alternative. Doug’s RV 15 has got my attention. If only there were dynamometer numbers available for some of these popular cams, and builds, selecting a new stick would be an easer task.

Bill
Author:  wjajr [ Mon Jan 10, 2011 5:30 am ]
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Charrlie, dynos are far and few around here in boony land, and the cash to rent one even harder to locate. I would have to rely on reports from others.


63Dart:
Quote:
The idea would be that you could use a cheap $5 phone app to get a *rough* sense of whether something you just did to an engine made it faster or not.
Confused wise assed codger:

So I have Suregrip, would it mater which rear wheel I duck taped my Trac Phone to in order start building this wireless app base line?

Ooops, forgot the washing machine got my phone… I was developing a centripetal force base line a few weeks ago comparing; He to Top Loaders…

Bill LOL
Author:  slantfin [ Mon Jan 10, 2011 7:59 am ]
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So what is the secret to a quick-revving engine like that?
Author:  63Dart [ Mon Jan 10, 2011 12:01 pm ]
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LOL - I bought a Trac Phone once for a friend who needed a phone ASAP. Amazingly, it was a better *phone* than my expensive HTC Android phone. The problem with the new smartphones is that they do everything really well - EXCEPT FOR MAKE PHONE CALLS!

I figure that since my Android phone is a crappy PHONE, I should try and at least make it do something useful by using it as a fake dyno.

:D
Quote:
Charrlie, dynos are far and few around here in boony land, and the cash to rent one even harder to locate. I would have to rely on reports from others.


63Dart:
Quote:
The idea would be that you could use a cheap $5 phone app to get a *rough* sense of whether something you just did to an engine made it faster or not.
Confused wise assed codger:

So I have Suregrip, would it mater which rear wheel I duck taped my Trac Phone to in order start building this wireless app base line?

Ooops, forgot the washing machine got my phone… I was developing a centripetal force base line a few weeks ago comparing; He to Top Loaders…

Bill LOL
Author:  Doctor Dodge [ Mon Jan 10, 2011 5:58 pm ]
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Quote:
So what is the secret to a quick-revving engine like that?
The Zing engine has really light weight bottom-end (rotating assembly) parts... the 63 Dart engine is just a good combo of parts, assembled to closely match the vehicle's intended use.

The only "secrets" are to be realistic about the RPM range you operate the vehicle in... most of the time, then carefully match parts and tune to support that driving range.
So it is a matter of bumping-up the cam, compression and air flow to match your target RPM range... and not going "over-board".
How high do you want to rev the engine?
DD
Author:  slantfin [ Mon Jan 10, 2011 8:27 pm ]
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I was mostly asking from curiosity. That 63Dart winds up surprisingly quick. I figured it had to do with ignition, but I can see how more rotating mass would have greater inertial resistance, especially if the balance wasn't exact.
My slant car is on a pay-as-you-go basis, so I'm waiting for the stock exhaust to wear out before I replace it. It's the choke point now that the intake, compression and cam have been upgraded. It's already better than past slant sixes I've owned, thanks to slantsix.org.
Author:  63Dart [ Mon Jan 10, 2011 9:27 pm ]
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Here's a video that I shot the other night. Sorry for the "Blair Witch" effect - I don't photograph too well - but the motor sounds awesome!!!

http://www.youtube.com/watch?v=iJC5rK3calI
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