#53416 - 11/12/09 05:22 PM
Re: Dyno day for a 250
[Re: russk]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2335
Loc: Dysart, Iowa
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Thankyou Russk,
The dyno charges as of now were more than what I recieved from you guy's by abit.
Total recieved was an amazing 1405.00 from about 30 of you! So the charges are off by about 400.00. I am ok with that.
There is more running to be done yet and hope to get more clean runs this weekend.
Guy's the multicarb thing is a tough one. The only way I'd be interested in doing it is if someone had a good running setup to try. It would take alot of time for me to set one up (jetting and such). Tom
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#53418 - 11/12/09 06:34 PM
Re: Dyno day for a 250
[Re: tlowe #1716]
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Mean buzzen half dozen A.K.A. Hank
Active BB Member
Registered: 09/23/04
Posts: 4550
Loc: Ca
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I have stated before ,,I ran 3 48 MM side draft weber DCOE's w/something around 46 MM choke tubes,(not much smaller than the throttle valves.
The carbs were too big for my 250,,,but,,, with those carbs,,that were even too big,,,made more power,,,more torque,,,better streetability than any 2 bbl ,4 bbl, clifford or offy intake combo I ever tried,,,& believe me I tried almost all popular carb combos & even not so popular carbs,(thermoquad)example) with both the clifford & offy intakes.
I just wish I started off with the Webers first thing,,I would have won a lot more races w/those ;-)
I think the 3 48MM webers flowed about 1100 SCFM.
It seems w/Webers,,,it's kinda hard to over carb. 
MBHD
_________________________
12 port SDS EFI 
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#53462 - 11/15/09 07:37 PM
Re: Dyno day for a 250
[Re: 67pete300]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2335
Loc: Dysart, Iowa
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67pete,
We are testing this engine and the 292 for street driven/ proven combo's. Each cam, intake, head is tested. Idle vac readings are taken and pulls start at 2500 rpm and go till the hp falls off.
A stock built lower end would do the job. But repeatability is what is desired. After the dust settles, There would certainly be a home for the motor.
For the 250 build, the components would be setup for longevity. Crank/ rods/pistons balanced. Forged pistons, crower rods (have them).
With the time/labor invested, all would be wasted if the base of the test mule started to decline during running of all the pulls.
I am all for a test of the Comp series of cams for the 250. Can someone get them to donate them? I have tried and got no help. Tom
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#53467 - 11/16/09 08:54 AM
Re: Dyno day for a 250
[Re: CNC-Dude #5585]
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Kerry Pinkerton
Active BB Member
Registered: 01/04/08
Posts: 123
Loc: Near Huntsville, Alabama
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Guys, my 250 originally came with a .600 lift cam that I removed because it wasn't streetable. Appears to be barely broken in but I didn't see any markings or numbers so I don't really know what it is. I supposed it can be measured.
At any rate, if you want to add it to the mix, I'll be glad to donate it to the cause.
Tom, I have the CompCam 260 in mine along with the head you did... Alum pistons, 60 over. Offy intake, Clifford truck headers, Edelbrock 500. Is that close to one of the configurations in the plan?
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#53469 - 11/16/09 09:41 AM
Re: Dyno day for a 250
[Re: CNC-Dude #5585]
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Kerry Pinkerton
Active BB Member
Registered: 01/04/08
Posts: 123
Loc: Near Huntsville, Alabama
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I'm not opposed to pulling my Edelbrock and loaning it for the test but it is on my car and I'd a short turnaround. Don't know the issue with shipping a gas smelling carb these days either.
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#53507 - 11/17/09 06:47 PM
Re: Dyno day for a 250
[Re: Al]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2335
Loc: Dysart, Iowa
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Al, james, Jalopy, and others,
Thankyou again for your help. Glad to see the support!
Kerry,
I do have a Edelbrock 500 and 600 sitting here. Why don't you bring that roadster up and we will have some fun!
I am presently getting the pieces together to form up the 250 lower end. Try to pick a date in January. We will see what happens.
Tom
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#53595 - 11/22/09 08:12 AM
Re: Dyno day for a 250
[Re: Kerry Pinkerton]
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Kerry Pinkerton
Active BB Member
Registered: 01/04/08
Posts: 123
Loc: Near Huntsville, Alabama
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Tom, on the 292 thread you mention that you're pushing the 292 to 5400 RPM and that's into the concern range.
Of course with all the problems and crap with my 250 I'm not sure what to believe but the guy I bought it from said that the builder said his engines (built for the Nascar dirt track series in VA) would turn 6000 all day.
I doubt that my engine will ever see close to 5000 but just wondering...given the shorter stroke, what is the RPM range for a flat top alum piston, small block rods, balanced 250?
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#53605 - 11/22/09 04:26 PM
Re: Dyno day for a 250
[Re: strokersix]
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Mean buzzen half dozen A.K.A. Hank
Active BB Member
Registered: 09/23/04
Posts: 4550
Loc: Ca
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I think unable to reach performance potential due to harmonics qualifies as a failure mode.
I do not see it that way,I'm thinking failure = broke something,,I changed the damper & then would go to 7500 RPM.Which reached beyond my performance expected,AKA potential.
But,,,to each his own.
It was a learning process,,no company tells you straight out,,,,,if you want to rev your inline over 5500,,,you must get a different damper,,,that was back when I used to talk to Jack Clifford for advise, & I must say,,,most advise I got from him & his staff was pretty bogus. IMO
MBHD
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12 port SDS EFI
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#53607 - 11/22/09 05:19 PM
Re: Dyno day for a 250
[Re: Mean buzzen half dozen A.K.A. Hank]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2335
Loc: Dysart, Iowa
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Kerry,
To answer your question. 6000 is a safe rpm for a 250 if built correct. They will go much higher in RPM but those are different engines than we run. The valve springs you have will also allow you 6K rpm. Tom
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#53924 - 12/03/09 07:16 AM
Re: Dyno day for a 250
[Re: Al]
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Drew
Active BB Member
Registered: 02/17/03
Posts: 7
Loc: Hayward, Ca
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hello! i lurk on here from time to time but dont do much posting. But this seems like such a good cause I'm in too. I just sent some money via paypal. im interested especially because this fits in with my 63 nova. it currently has a 230 with clifford 270h cam, intake, and headers. It has the 390 holley and a head that i ported myself and shaped the intake boss into a wing with 1.94 valves. I have a 250 sitting in the garage so this will be great for a possible build down the road. Keep up the good work this is great stuff!
Edited by Drew (12/03/09 07:16 AM)
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#53977 - 12/04/09 08:20 PM
Re: Dyno day for a 250
[Re: SCRAPIRON, #4711]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2335
Loc: Dysart, Iowa
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Ok guy's,
Pulling a greasy 250 down and going to document the build on it. This will be the 250 for the dyno tests.
It will be fully balanced with:
Custom pistons (flat tops)
Crower Billet rods (allready have them)
zero decked
Allign honed mains
Find out overbore after teardown, try to keep to a minumum. This lower end will be reved to a higher rpm on the dyno for testing.
Thanks for the contributions so far on this 250. Tom
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#53986 - 12/05/09 10:31 AM
Re: Dyno day for a 250
[Re: CNC-Dude #5585]
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russk
Active BB Member
Registered: 03/20/06
Posts: 75
Loc: Southern Oregon
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CNC-Dude:
Very interested to see how your hydraulic roller cam works out, as well as your exhaust port plates. Sure would like to see some photos of each when you have the time.
I'm also curious about the Berta head project. I think you suggested some reshaping of the ports to improve (lower RPM) velocity might be worth looking at. In any event, if a new aluminum version of this head were to come to market at a price point similar to the CI small Ford head, I can't imagine that it wouldn't be purchased in significant enough numbers to be profitable.
Russ
Edited by russk (12/05/09 10:32 AM)
Edit Reason: typo error(s)
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#53992 - 12/05/09 12:47 PM
Re: Dyno day for a 250
[Re: russk]
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CNC-Dude #5585
Active BB Member
Registered: 09/27/08
Posts: 1743
Loc: N. Georgia
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Russ, the exhaust port plates was something I threw at Tom in the last days of testing. He was already overwhelmed with combos we had pre-planned to test, so naturally, we weren't able to evaluate them to their fullest potential. But right off the bat, I saw several changes that needed to be made immediately with the initial design, so that will give me an opportunity to rectify them, and then test them further. Also, since you have interests in the Ford 300's, im already seeing crossover potential for these plates with that engine as well, so don't worry, im already thinking way ahead.
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There's no such thing as too much cam....only not enough engine!
12 Port Head Manufacturer
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#53995 - 12/05/09 05:02 PM
Re: Dyno day for a 250
[Re: Twisted6 I.I #3220]
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CNC-Dude #5585
Active BB Member
Registered: 09/27/08
Posts: 1743
Loc: N. Georgia
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Mine are designed similar to others that companies that also make them that require no welding at all. I have never seen the style that PES makes, so I can't say what is required to be able to use their brand. But like Larry mentioned, I have also heard they require welding for installation, so making a version that will allow them to be installed without welding, or even any machine work, as mine are, is going to increase the marketing potential, I think, because of the greater ease in which they can be installed by the end user. Also, patent protection will also be an added feature incorporated into mine, so before this product will be revealed, that will be in place first.
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There's no such thing as too much cam....only not enough engine!
12 Port Head Manufacturer
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#54287 - 12/17/09 05:45 PM
Re: Dyno day for a 250
[Re: Randy S. Hager]
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SOB
Active BB Member
Registered: 06/25/06
Posts: 47
Loc: Burleson Tx.
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Tom; A C-note will be in tomorrows mail. Hurry! Wish I could afford more. (I do know how to pronounce Lowe)
SOB
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Bill Mulholland (SOB)
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