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A little science project [[[ updated]]]] #2421848
12/21/17 02:06 PM
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bean town ....Ca
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WHITEDART Offline OP
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Working on both side of the motor

20171212_163139.jpg
Last edited by WHITEDART; 12/29/17 07:22 PM.

In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2421853
12/21/17 02:09 PM
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I guess you could say in and out

25997.jpeg

In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2421871
12/21/17 03:33 PM
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What r u up to now Shiloh?

Re: A little science project [Re: WHITEDART] #2421878
12/21/17 03:44 PM
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Originally Posted By WHITEDART
I guess you could say in and out


Judging by the shoe comparison, I would guess 10 inch wide collectors. LOL
Thanks for sharing and yes, I know they are on a table.
But is the O2 sensor bung in the correct spot?
I thought they were supposed to be half way back in the collector?
Just asking to learn a little more.
MERRY CHRISTMAS.


Old Geezer Racing
Re: A little science project [Re: SCATPACK 1] #2421897
12/21/17 04:43 PM
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Well I run a 9.6 deck block.. and the 420 intake is for a low deck so I've had to use spacers to make it work.. I cut it in half and shipped it to Brett Miller.. he's going to stretch it I think close to 5/8 of an inch.. it will make the plenum larger in the runner shorter... the idea behind the collector is it has a 3-inch pinch. Versus the 2.5 that I'm running right now.. trying to find a happy medium between acceleration and mph


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2421899
12/21/17 04:48 PM
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I've heard that the merge type collectors are good and others say help grin no good confused
I have seen ET and MPH gains at the track by changing collector length and primary pipe lengths, what are your thoughts and findings?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: A little science project [Re: Cab_Burge] #2421906
12/21/17 04:59 PM
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Well going from a 2.5 pinch to a 4'open collector I seen a 12 horsepower increase on the dyno.. which was a significant find more than any other single change that we made including from small carburetor to Big carburetor.. but the smaller collector accelerates the car so much faster it actually provides a better time slip. Now keep in mind this is on a fairly heavy two speed small block.. mph is definitely down with the smaller collector


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2421909
12/21/17 05:04 PM
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Isn't it amazing what the motor does on the dyno with changes compared to what it does in the car at the track and the different results.
Did you test jet changes to go both leaner and fatter with the smaller collectors? work grin
Your car and your results are great bow up
Keep testing wrench whistling


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: A little science project [Re: WHITEDART] #2421917
12/21/17 05:14 PM
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I think what most people miss with collectors is the actual effect that it has on the carburetor.. you could easily need a four or five jet increase or decrease with different collectors.. and what provides more power on the dino isn't always the fastest way down the track


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2421919
12/21/17 05:15 PM
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Originally Posted By WHITEDART
and what provides more power on the dyno isn't always the fastest way down the track
up You be correct on that one up devil whistling


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: A little science project [Re: WHITEDART] #2421922
12/21/17 05:18 PM
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What we're looking at is finding the happy medium.. Greg thought the collector he built before was a little small for what we're trying to do now.. Greg is also the one that chose where to put the bung these collectors are very short and so I think if you moved the bung towards the rear it may pull in clean air.. I will say that there's a possibility with a converter change and gear change I could take advantage of the larger collector.. but some of these science projects can become expensive panic


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: Cab_Burge] #2421924
12/21/17 05:20 PM
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It likes the smaller tubes on the primaries to
give you more torque in the lower RPMs due to
the trans... I cut one of those intakes in half
to fit a engine.. it was for testing
wave

Re: A little science project [Re: WHITEDART] #2421935
12/21/17 05:37 PM
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Originally Posted By WHITEDART
Well going from a 2.5 pinch to a 4'open collector I seen a 12 horsepower increase on the dyno.. which was a significant find more than any other single change that we made including from small carburetor to Big carburetor.. but the smaller collector accelerates the car so much faster it actually provides a better time slip. Now keep in mind this is on a fairly heavy two speed small block.. mph is definitely down with the smaller collector



A three speed would probably help the big collector accelerate as fast or faster than the pinch collector but...as you know it's hard to control all that low gear, especially if you are running leaf springs (which, IIRC you are) so at some point you have to do what you are doing.


As I've always said, if it makes more power in the dyno it SHOULD go faster in the car. Gearing, converter, suspension and shocks can all make an engine with more power go slower.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: A little science project [Re: madscientist] #2423349
12/24/17 11:49 PM
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Intake stretch 2.0.. it made the trip safe and sound and is now in the fixture..

27401.jpeg

In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2423356
12/25/17 12:02 AM
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the way it used to look with the adapter... this stretch will let the motor see the booster better..

26569.jpeg

In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2425481
12/29/17 07:23 PM
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Engine development.1o1

28189.jpeg28191.jpeg

In the 8s N/A.with Brett miller W8's
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Re: A little science project [Re: WHITEDART] #2425487
12/29/17 07:27 PM
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Now Brett will work his magic.. with this process we enlarge the plenum and shorten the runner..


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: A little science project [Re: WHITEDART] #2425497
12/29/17 07:38 PM
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Re: A little science project [Re: WHITEDART] #2425617
12/30/17 02:32 AM
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That's going to turn out awesome, be interesting to see how the engine response to it.

Re: A little science project [Re: WHITEDART] #2425670
12/30/17 05:48 AM
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Originally Posted By WHITEDART
Now Brett will work his magic.. with this process we enlarge the plenum and shorten the runner..


Almost All mods Lengthen the runner on the plenum floor for best results on a single plane like that. Yours will want that too. Huge plenum short runners equals slow port velocity. Bad for fuel atomization and cylinder fill. shruggy stirthepot

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