Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Labratt]
#1066119
08/30/11 10:12 PM
08/30/11 10:12 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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Posts: 7,506
Az
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I run them both. 1" 4 hole tapered Wilson in to a 1" open. They sit on a Victor 340. I know a 4 hole will improve the signal to the carb - could be better for street driveability. This is just my opinion, but the larger you can make the plenum and the farther you get the carb from the port runners ( within reason on a single plane manifold ) the more even the fuel distribution will be.
Fastest 300
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: rt66jim]
#1066123
08/31/11 12:36 AM
08/31/11 12:36 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
On my 416 with a PF950HP the 4 hole was worth .1 and 1.5mph. Victor W2 intake. Jim
Did you try any other types (open or stacking a open and a 4 hole)... also where did it pick up... was it in the 60'.... was that a 1" or 2"
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Cab_Burge]
#1066125
08/31/11 10:21 AM
08/31/11 10:21 AM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Take both of them to the track and test them...
Yep... and they might work best w/ slightly different jetting, too.
Randy - Are you going back to the track over the Labor Day weekend?
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Labratt]
#1066127
08/31/11 10:53 AM
08/31/11 10:53 AM
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Joined: Jan 2003
Posts: 18,025 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
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Posts: 18,025
S.E. Michigan
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Definitely worth trying especially stacking them up, it's sort of a poor man's super sucker.
Mine picked up around 18hp with the right spacer combo, back when I had a street dominator 383 intake. But that was 3" worth of spacers which told me the manifold was lacking something.
The victor 383 intake was better to begin with and it only picked up 7hp with the addition of an open spacer..... a 4 hole spacer did absolutely nothing. It did not even change A/F ratio noticeably.
It's worth testing at somewhere like Jake's, so you can catch the little changes (ya know, 7, 8HP or whatever) when you come across em. It ain't much but if you got it, keep it! Myself I would have a hard time seeing 7hp on a timeslip but I am really not that good....
Rich H.
Esse Quam Videri
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Dunnuck Racing]
#1066129
08/31/11 12:35 PM
08/31/11 12:35 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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Joined: Oct 2003
Posts: 7,506
Az
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Personally, I think quantifying small improvements at the track is difficult at best. Just an hour between runs can cause DA, ambient air temp, track conditions, eng temps, to change your Et by a tenth. Thats where dyno testing shines. If I am looking for small improvements at the track, I rely on the MPH numbers before the ET #'s.
Fastest 300
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: BradH]
#1066130
08/31/11 12:41 PM
08/31/11 12:41 PM
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Joined: Jan 2003
Posts: 5,903 Florida
Locomotion
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Florida
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Quote:
Quote:
Take both of them to the track and test them...
Yep... and they might work best w/ slightly different jetting, too.
.....as well as pump squirter sizes!
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Crizila]
#1066131
08/31/11 12:42 PM
08/31/11 12:42 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
Personally, I think quantifying small improvements at the track is difficult at best. Just an hour between runs can cause DA, ambient air temp, track conditions, eng temps, to change your Et by a tenth. Thats where dyno testing shines. If I am looking for small improvements at the track, I rely on the MPH numbers before the ET #'s.
MPH is what the engine is making(power wise) ET is what the chassis is doing
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: BradH]
#1066133
08/31/11 03:31 PM
08/31/11 03:31 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Quote:
Is that picture the Bigs-modified "950" you borrowed? That looks like an old 850 w/ the choke horn cut off and blended. Can you post a picture of the carb you're testing against my Demon?
You're not testing until the 23rd or 24th??? "Dude, where's my car(b)?"
I'm sure thats my 850 in the pic(looks like it) but he brought it back so I could put it on my new street engine
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Re: OPEN 1" SPACER VS. 4-HOLE 1" SPACER
[Re: Crizila]
#1066134
08/31/11 09:31 PM
08/31/11 09:31 PM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
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Prospect, PA
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Quote:
Personally, I think quantifying small improvements at the track is difficult at best. Just an hour between runs can cause DA, ambient air temp, track conditions, eng temps, to change your Et by a tenth. Thats where dyno testing shines. If I am looking for small improvements at the track, I rely on the MPH numbers before the ET #'s.
This is true for me and my car. Although I track and record considerable information, I'm just not consistant enough. I always use a weather station, and repeat the change to confirm. I would say that half the time I cannot repeat the improvement that I thought I found.
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