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Go back and vote on this image.
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Picture
Information
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| URL:
http://riceornot.ricecop.com/?auto=25175 |
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| Comments: 14 (Read/Post) Favorites: 0 (View) |
Submitted
on: 07-13-2003
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 View Stats |
Category:
Vehicle Misc |
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Description:
see #21574 |
Showing page: 1 of 1
[ 1 ]
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| #1 |
7-13-2003 @ 10:34:39 PM |
| Posted By : Jon |
Reply | Edit | Del |
Gah damn it, DiRF, someone, change the number to 25174, please?
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| #2 |
7-13-2003 @ 10:37:33 PM |
| Posted By : Skid |
Reply | Edit | Del |
Wha-ha! It's a big friggin' motor. :)
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| #3 |
7-13-2003 @ 10:39:50 PM |
| Posted By : Jon |
Reply | Edit | Del |
#2, Do you see the Mopar from 25174?
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| #4 |
7-13-2003 @ 10:41:21 PM |
| Posted By : Skid |
Reply | Edit | Del |
#3, Nope, but I gather that "Mopar" is somewhere on this motor.
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| #5 |
7-13-2003 @ 11:01:14 PM |
| Posted By : Jon |
Reply | Edit | Del |
Look underneath the carbs.
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| #7 |
7-13-2003 @ 11:20:40 PM |
| Posted By : LordFlux |
Reply | Edit | Del |
I'm not familiar with this engine. Why is the valley open like that?
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| #8 |
7-14-2003 @ 08:27:16 AM |
| Posted By : Jon |
Reply | Edit | Del |
When the air and fuel have a longer distance to travel, it supposedly mixes them together more, making it better for the engine.
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| #9 |
7-14-2003 @ 08:30:58 AM |
| Posted By : Lemming |
Reply | Edit | Del |
#8, Other benefits, too--for some applications, it is preferable to have a long intake runner. If the proper length/width is chosen, it is possible to increase the air's velocity, which is beneficial for low-end torque (helps exhaust scavenging, I'd imagine).
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| #10 |
7-14-2003 @ 08:33:09 AM |
| Posted By : kstagger |
Reply | Edit | Del |
hmm... it was always my understanding that tunnel rams hurt low end torque... and were generally worse for street driven cars, as most of the power is higher in the RPM band. Not a problem for dragsters or if you have enough cubes.
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| #11 |
7-14-2003 @ 08:38:32 AM |
| Posted By : Lemming |
Reply | Edit | Del |
#10, Perhaps so, but I've never paid too much attention to carbed applications and how exactly tunnel rams are designed.
On FI applications, long runners are generally used for velocity effect (low RPMs) and short runners are typically used for higher RPMs. On my engine, for example, I have a set of long runners that are around 3-4" longer which are open all the time. At around 3000 RPM, a vacuum-controlled motor snaps open some control plates which normally block off a secondary (shorter) runner to each cylinder, allowing the engine to make power 'til it hits redline. If the engine only had the long runner, it would run out of steam by 3000 RPM, and if it only had the short runner, it would be unstreetable.
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| #12 |
7-14-2003 @ 08:43:47 AM |
| Posted By : Lemming |
Reply | Edit | Del |
#10, Tunnel rams apparently have some rather wide runners, and they're very straight. Both of these things would hurt air velocity at low RPMs, where you would want a narrower tube (isn't that Bernoulli's principle?). The runners are very straight, too, so I can imagine that there's a fair amount of useless turbulence until the engine's turning fast enough to really move some air.
http://www.profilerperformance.com/...adport-170.html
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| #14 |
7-14-2003 @ 09:06:55 AM |
| Posted By : kstagger |
Reply | Edit | Del |
I'm a carb man myself... but the tunnel ram is more like a single plane intake... obviously it requires alot of tuning to get right... but may be worth the effort it appears.
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