| Gary Stubbs |
03-09-2010 11:53 AM |
single/dual plane intake
Is a dual plane a more streetable intake. It is a vic jr with 650 holley on vic jr heads. With the nasty cam it does not like 1600 or lower when getting on it. You know that hesitation. Have a half inch spacer also. Just wondering if i can put a piece of aluminum in the intake and make it adual plane so it works better for the street. Any ideas would be appreciated.
gary
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dual plane is more streetable.....
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| Ron61 |
03-09-2010 12:15 PM |
What FWB said. The dual plane gives you more low end torque. The single plane is more of a racing type. I have ran both types and the dual plane is far better for normal driving plus it also works well if you are not all out racing.
Ron ;)
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| joyridin' |
03-09-2010 12:19 PM |
Unless you run in the upper RPM range all the time, try to find something like an Air-Gap style intake. Kind of the best of both worlds. Has a wide torque range with a decent upper limit, plus it is pretty streetable.
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| blykins |
03-09-2010 12:30 PM |
It also depends on the size of the engine as well. A Victor Jr. on a 351W will have different results than a 427W with a Victor Jr.
If your cam doesn't like to be pulled down that low, it may not help things to mix a wild cam with a dual plane street intake. That would be a mismatched combo.
What size is the engine? What are the cam specs?
Also, hesitations can be tuned out as they are generally because of a lean situation.
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| Gary Stubbs |
03-09-2010 01:20 PM |
The engine is a 347 stroker. Cam specs are adv dur of 286, dur @.050 of 230, lobe sep of 110.0 and lift of .598. A comp cam. I really do not want to change cams right now, maybe this summer. My goals have changed so a milder setup is probably best. Currently dynoed or 2 yrs ago at just under 480 at flywheel. Seems high but is a nasty rumble. Also, no choke on carb.
Txs gary
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| blykins |
03-09-2010 01:21 PM |
That cam shouldn't be that wild. I think an RPM Air Gap would suit the engine well. If you're having hesitation issues, it's most likely a carb tuning issue.
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| ERA Chas |
03-09-2010 01:29 PM |
Quote:
Originally Posted by blykins
(Post 1034741)
That cam shouldn't be that wild. I think an RPM Air Gap would suit the engine well. If you're having hesitation issues, it's most likely a carb tuning issue.
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X2-what Brent said. |
| CobraEd |
03-09-2010 01:42 PM |
The lift is very high for that mild duration. I have not seen that cam listed. Is it custom from Comp Cams?
.
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| FUNFER2 |
03-09-2010 02:27 PM |
(high lift) ? It looks like that's "advertised" duration.
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| Gary Stubbs |
03-09-2010 02:36 PM |
A 35-450-8 or a 286H-R10 by comp cams
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| CobraEd |
03-09-2010 02:59 PM |
That must be one of the two versions that Comp Cams makes specifically for the stroker 302 (331/347). I have seen them in Jegs.
With 286 total duration and .598 lift. I still believe that is a lot of lift the that small amount of duration. :confused: However, if it works, it works. Just hope it lasts. With that lift to duration ratio, it can put a big strain on the valves.
.
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| vector1 |
03-09-2010 04:06 PM |
you're out of the rpm range with the cam. wait till 2000+rpm til you get on it, or fix the tune, or remove the spacer, or change the manifold. lot of variables here. i would do the easiest first though. o2 sensor and gauge setup could tell you a lot about the hesitation.
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| FUNFER2 |
03-09-2010 04:16 PM |
A lot can be done with just tunning to what the engine wants. Do you have a local business that has a chassis dyno, and a well trained mechanic, and not just a computer geek ? :eek:
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| Bernica |
03-09-2010 04:32 PM |
If I'm not mistaken, there is more of a difference between a single and dual-plane manifold besides just adding an aluminum separator. I may be wrong. If so, I'm sure I will be corrected. Agree with others above on other points.
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| vector1 |
03-09-2010 04:36 PM |
i was going to add what gear is this occuring?
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| Gary Stubbs |
03-09-2010 04:40 PM |
Don't get me wrong about this engine. It is one bad engine. When I nail it i better grab a gear or i am to late. Have only been into the secondaries a dozen times. Thru third gear is a kick even with granny shifting and a 6 k rev limiter bug in. Definitely has the old style lope of a roller. Just what i wanted when i asked gordon what he thought. My wants have changed is all. Had a 6.5k limiter in it at first and never nosed over.
gary
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| CobraEd |
03-09-2010 04:42 PM |
Quote:
Originally Posted by Bernica
(Post 1034788)
If I'm not mistaken, there is more of a difference between a single and dual-plane manifold besides just adding an aluminum separator. I may be wrong. If so, I'm sure I will be corrected. Agree with others above on other points.
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The whole design is different. You can put a divider in a single plane manifold, but it is a band-aid solution and not the same as a true dual plane manifold.
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| Mus408 |
03-15-2010 06:10 PM |
The RPM Air Gap dual plane would be the way to go on that engine,for excellent torque/power in the real world of street use.
Don't put a divider in the single plane intake. I had one break loose,after 6 months use,and it cost a block!
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| Barry_R |
03-16-2010 06:05 PM |
few ideas
You could advance the cam a few degrees (depending on where it's installed now).
Try adding some base timing and shorten the curve to compensate - this usually improves idle and low end.
As noted a surge or lumpiness at part throttle is often a fuel curve issue that can be tuned out.
I've tried a bazillion different intake inserts, stuffers, and spacers on the dyno. Most do nothing. A very few seem to help - but they're never predictable.
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