C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Accel Runners

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Old Jun 24, 2003 | 09:26 AM
  #1  
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Default Accel Runners

Is it worth buying them if I can get them for $200?
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Old Jun 24, 2003 | 09:40 AM
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Default Re: Accel Runners (JayB119)

why not :cheers:
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Old Jun 24, 2003 | 09:50 AM
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Default Re: Accel Runners (JayB119)

Not if you don't port the plenum and intake manifold.
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Old Jun 24, 2003 | 09:59 AM
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Default Re: Accel Runners (JayB119)

I've got the Accel runners on my '85-it came with them already installed-and after driving another stock '86, my car does feel like it has a stronger mid-range. As far as I know my '85 doesn't have any other engine mods that I know of (I bought it as a repo so I don't have any history on it). Don't know if that helps but $200 sounds pretty darn reasonable. :flag
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Old Jun 24, 2003 | 10:32 AM
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Default Re: Accel Runners (helopilot)

Buy em!

If you're too lazy to port (or buy) a ported plenum, then sell them here for $300 and make a little off the deal. :jester
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Old Jun 24, 2003 | 01:33 PM
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Default Re: Accel Runners (JayB119)

If I port the plenum but not the intake manifold will this modifacation help at all?
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Old Jun 24, 2003 | 01:35 PM
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Default Re: Accel Runners (JayB119)

i would save up and get the AZ Speed and Marine Siemes ones. :D
but that is me
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Old Jun 24, 2003 | 01:59 PM
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Default Re: Accel Runners (JayB119)

If I port the plenum but not the intake manifold will this modifacation help at all?
Yes they will help without any porting work to the intake. The runners are the most restrictive part of a TPI and that's including the base.
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Old Jun 24, 2003 | 05:10 PM
  #9  
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Default Re: Accel Runners (NUckINg FuTS)

My results differed. The runners were not great, but better than the manifold. The heads (early AL) were pretty bad too; the exhaust side was awful.

Now, if you put on 1.7" diameter runners on an intake manifold that's only 1.5", you've got a .1" wall the air is flowing into and creating an eddy that tightens the effective diameter. Plus, you're feeding the 1.7" runners with a 1.5" plenum. Bolting runners on without porting would probably yield no gains or even a loss.

The good thing about the cast runners is that you can siamese them.
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Old Jun 24, 2003 | 06:15 PM
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Default Re: Accel Runners (JayB119)

JayB119, you can use my dremmel to port your plenum. I did it to mine, it is real easy. I live in Hazel Park, so I'm not far. I could guide you through it. You can IM me if you are interested. :seeya :steering:
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Old Jun 25, 2003 | 03:46 AM
  #11  
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Default Re: Accel Runners (JayB119)

I would grab them then save up few bucks and buy TPIS Big Mouth manifold and have a winter porting project.
I did the same thing works well
:seeya
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Old Jun 25, 2003 | 08:13 AM
  #12  
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Default Re: Accel Runners (JayB119)

If I port the plenum but not the intake manifold will this modifacation help at all?
I don't think you'll see much of a gain until you do all three (runners, plenum, intake)
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Old Jun 25, 2003 | 09:10 AM
  #13  
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Default Re: Accel Runners (JayB119)

Thanks for all the help. I think I am going to buy them and if I have to wait to port the other two things at least I have the runners done.
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