L100 Flathead Cam

[KiWinUS]

Originally Posted by PeterC

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That's my 35 3 window engine ... we tried running with straight pipes ( I do like loud) but that was sooooo loud that we had to put mufflers on!

PeterC , you are truly blessed to have such an awesome car & then you add that truly magnificent L100 equipped blown Flatty !!! WOW
How is the gas mileage with a pump on her ?
Cheers
KiWi-Tony

[PeterC]

Originally Posted by KiWinUS

PeterC , you are truly blessed to have such an awesome car & then you add that truly magnificent L100 equipped blown Flatty !!! WOW
How is the gas mileage with a pump on her ?
Cheers
KiWi-Tony

Gas mileage is somewhat an oxymoron - but around town in low (4:11) around 9 mpg

[KiWinUS]

Originally Posted by PeterC

Gas mileage is somewhat an oxymoron - but around town in low (4:11) around 9 mpg

yea Pete I hear you , just curious !
Really with an awesome car/engine like you have !!
Who cares !!
Cheers mate !

[Ol' Ron]

Sounds like it's running too rich, This will kill power and wash the cylinderwalls with gas which doesn't help the rings. Install anAF meter and start tuning the engine.

[scooder]

Originally Posted by jimTN

Wonder how it would look on the tach on the backstretch wound tight with a 28t second and 4:11 rear.

If your talking about the L100, that tach will bounce around 6800-7000 rpm if it's all setup right.
Martin.

[Ronnieroadster]

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Originally Posted by Ol' Ron

Sounds like it's running too rich, This will kill power and wash the cylinderwalls with gas which doesn't help the rings. Install anAF meter and start tuning the engine.

Ron really running to rich? Tell us all whats the proper A/F ratio for a well tuned supercharged flathead driving in traffic and highways. Ever do this test driving?

[bobH]

A/F is A/F is A/F... Why should the combustion process care if it's fed by a huffer? Of course OlRon checks this while driving, about the only useful way. I'd be paying close attention to Ron.
We all know the 'undesirables' that happen when you get too far on either side of stoichiometric.
Just my opinion...

[Mike B]

Originally Posted by Ronnieroadster

Ron really running to rich? Tell us all whats the proper A/F ratio for a well tuned supercharged flathead driving in traffic and highways. Ever do this test driving?

IIRC 14.7 to 1.

What's yours at?

[Ol' Ron]

We run in the mid 15's, but you have to watch the ignition timing. Better mileage tho.

[Bored&Stroked]

Originally Posted by Tim Ayers

Or the mighty Potvin 3/8ths

https://www.youtube.com/watch?v=9akeT4Ua9lU

https://www.youtube.com/watch?v=bI5VnSkOfb0

Hey . . . I recognize that first one . . . built the engine with Chris Daniels and that video is in my barn! It is a really nice running engine - 276 cubes, ported, street relief, Harman-Collins dual coil . . . runs really nice. I do love the Potvin 3/8 cam, but I have never ran a L100, so have no opinion on it. Pete ground the cam for us.

Just keep building those flatheads boys!

PS: I'll have a video of a 'new' engine I'm building for my 32 Cab - it is a 284 cube 42 Merc (3 5/16 x 4 1/8), heavy port-relief work, big custom roller cam . . . who the hell knows if the cam will even run, but we're going to find out!

[Bored&Stroked]

Originally Posted by Mike B

IIRC 14.7 to 1.

What's yours at?

I'd never run a blown gas motor that lean (at least under load, which is where you need to be concerned). Truth be told, I'd not even run a full-race NA carbed motor that lean. At partial throttle, pulling vacuum . . . okay, but not under load.

One does have to think about the fact that a blown motor (without an intercooler) will pre-heat the intake charge, which will contribute to detonation (the death of a motor).

If I'm tuning a blown motor under load (dyno), I like to see the AF about 12 to 12.5 to 1 (max). You have to really pay attention to ensure that you don't run too lean or put too much timing into it - or you'll detonate it . . . and then you can get your wheelbarrow out to pick up the pieces.

Obviously boost levels come into play - at lower boost levels (say 4 - 6 lbs), you might be able to run a bit leaner (depending on the gas you're running, advance, etc). Even then, I'd tune to a figure no higher than 13 - 1.

Me - I stay safe!

B&S

[Bored&Stroked]

Originally Posted by bobH

A/F is A/F is A/F... Why should the combustion process care if it's fed by a huffer? Of course OlRon checks this while driving, about the only useful way. I'd be paying close attention to Ron.
We all know the 'undesirables' that happen when you get too far on either side of stoichiometric.
Just my opinion...

On a blown motor you care because of heat and resulting detonation - see my post below.

[JSeery]

It's like an air-cooled engine their using a rich mixture to cool the engine combustion chamber.

[Ronnieroadster]

Originally Posted by Mike B

IIRC 14.7 to 1.

What's yours at?

!2 to 12.5 just like Dale wrote. 14.7 is fine if your driving a Prious ! But were talking about modified flathead's if milage is what your after than the modfications shown are really not going to get the best milage. However if we measure the smiles per mile with these modified flatheads than that number would be very high for sure.

[Mike B]

Originally Posted by Ronnieroadster

!2 to 12.5 just like Dale wrote. 14.7 is fine if your driving a Prious ! But were talking about modified flathead's if milage is what your after than the modfications shown are really not going to get the best milage. However if we measure the smiles per mile with these modified flatheads than that number would be very high for sure.

lol! Smiles for miles...like that!

But I'd thought you had asked for around town driving?

Heck, at WOT in my OT EFI, I tuned for 12.5 :1 as well, but never messed with highway for economy.

What hurts a blown engine at stoic putting around town or on the highway even?

[Ol' Ron]

I wasn't considering a blown engine. With the right carb/ignition you can have an engine that preforms quite well at WOT and get pretty good mileage. Another consideration is longevity, at 12:1, I don't expect the rings last very long.

[HOTROD_WILLIE]

Thanks for all people who reply to the thread.

[HOTROD_WILLIE]

I just got L100 cam from Tony. In about 6 months I will have motor on Youtube.

[Bored&Stroked]

Originally Posted by HOTROD_WILLIE

I just got L100 cam from Tony. In about 6 months I will have motor on Youtube.

I prefer that you have the motor in a car!

[Ol' Ron]

There is a 294 going together in CT. that I did the block work on. The engine will run a Magnason blower and an original Cam Techniques supercharger grind. !5 years ago I built a 296 for this fellow (Still in the truck) This has been tuned to get 20 mpg on the road, but 14, city traffic with a C4. The magnason should help with cruise mileage. As for test driving. I've spent the last 5 years trying to get better mileage from these flatheads. With Richards help, we've come along way. I always try something different, just to see if it works, and Richard has made his own rods for the Edelbrock carb. Yes we do test drive, aand me without a drivers license.