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Old 04-08-2010, 09:55 AM
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Intake Advice

Hi,
I'm just finishing up with my 496 BBC. It has Mahle 18cc domes , Comp Cams XR280R ( 2500-6500), Pro Cromp oval port heads 300cc / 110 ( I'll report on how the heads performed later).3:73 gears and a built TH350 with a 2800 stall.
It will see track duty once or twice a month and street use a couple of times a week. All comments are welcomed on the above but my main question is...I have a Merlin dual plane intake # 6013. I've searched high and low on information on this intake without success. So...does anyone know if this will work with my combination? and if not...what would?

Thanks
Steve

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Old 04-08-2010, 10:48 AM
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Hi Steve,
How about contacting World products directly.

World Products
51 Trade Zone Court
Ronkonkoma, NY 11779
Tel: (631) 981-1918
Fax: (631) 737-0467
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Old 04-08-2010, 10:53 AM
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Thanks Richard...I did checkout their website but I'll give them a call
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Old 04-08-2010, 11:42 AM
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Your static compression ratio will be 10.88:1, are you sure you want to do that on the street with pump gas?
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Old 04-09-2010, 03:55 AM
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I thought it would be in the 10:4 area. It wont' be a daily but yes..10:88 is getting up there. What woulds be the most cost effective way to get it to a more suitable C/R?
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Old 04-09-2010, 04:24 AM
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Quote:
Originally Posted by BUCKOLA
I thought it would be in the 10:4 area. It wont' be a daily but yes..10:88 is getting up there. What woulds be the most cost effective way to get it to a more suitable C/R?
Machine some of the dome off the pistons if they have a solid dome. If that isn't an option then grind the chamber bigger in the head, such as relieving the chamber around the intake valve for more flow. You are riding close to the limit of what you can get away with on pump gas with aluminum heads. Get it down to around 10.3-1 and you should be fine.

The Merlin intake is basically the World Products version of an Edelbrock Performer RPM and is a good piece.
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Old 04-09-2010, 07:37 AM
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Quote:
Originally Posted by BUCKOLA
I thought it would be in the 10:4 area. It wont' be a daily but yes..10:88 is getting up there. What woulds be the most cost effective way to get it to a more suitable C/R?
Here are a couple of Sims I ran this morning on a BBC, one a 460 and one a 505. Both use a very low static compression ratio for compatibility on pump gas, but look at the insane power.....

Here, for instance is what I consider to be a real world build. It's a take-off on a Sim I ran for another fellow on here yesterday, but with a 8.9:1 SCR. This one uses a 460 cubic inch block with flat-top pistons, Patriot 320 heads (with flow factored down 10% from published figures to hopefully get into the range of reality) with 119cc chambers, 850 carb, RPM or Stealth intake and 1 7/8" or 2" headers through the mufflers. The cam is a solid roller, Comp 11-700-9 installed straight up with stock ratio rockers. Engineer the block deck height with the piston deck height and gasket thickness to achieve a 0.050" squish.
RPM HP TQ
2000 163 428
2500 210 441
3000 268 469
3500 347 520
4000 428 562
4500 505 590
5000 566 594
5500 603 575
6000 622 544
6500 616 498
Peak volumetric efficiency 97.7% @5500
Peak BMEP 194.5 @5000

Need a little more power and run it on a lower grade of pump gas? OK, build this 505 with flat tops at 8.9:1, 4.350" bore, 4.250" stroke, Racing Head Service 320 heads, 119cc chambers, RPM or Stealth intake, 850 carb, 2" headers through the mufflers, CompCams solid roller 11-713-9, installed straight up with stock ratio rockers. I might be thinkin' a Scat cast steel crank and Scat Pro Stock rods with SRP forged pistons for this one.
RPM HP TQ
2000 179 469
2500 231 486
3000 294 514
3500 377 566
4000 462 607
4500 541 631
5000 607 638
5500 635 606
6000 651 570
6500 618 500
Peak volumetric efficiency 95.8% @5000
Peak BMEP 190.3 @5000
Your 496 will give up only 4 hp and 5 ft/lbs from these 505 figures.
These are the heads I might be thinkin' of using. Fairly cheap and they work....
http://www.summitracing.com/parts/RHS-11301-03/

Last edited by techinspector1; 04-09-2010 at 07:45 AM.
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Old 04-09-2010, 06:21 PM
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T/I
My compression isn't the only thing "getting up there" This is going to be more of a hobby than a street thug. At my age I'm only looking for something to play with so I'm not opposed to giving up a few HP for reliability. I have my parts already so I'll look into getting them reworked to something a little less radical.

I never did here back from World Products so I appreciate your feedback Eric.

Thanks everyone
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