|
Crossram questions
http://i14.photobucket.com/albums/a3...4her/67_12.jpg
http://i14.photobucket.com/albums/a338/RaceU4her/s3.jpg I bought this manifold last year and havent put it on yet. Its going on my 289in my 65 comet. the carbs are 450cfm. Im wondering what you guys think would be a good for a cam and heads. Its going to be a street car but id like to get the most out of it i can. Im going to have 4.56 and a c4. I like a really rough idle and would like to stay solid lifter. any info would help. thanks guys |
shelby flat ram
I can't offer cam or any other recommendations. First I would like to congratulate you on securing possibly one of the rarest intake manifold ever made for a SBF. Did you acquire the special distributor too. Or you could go distributorless.
I was interested in these a while back. Then I started running searches on the Smokey Yunick version for a SBC. The low speed torque is nonexistant. Power doesn't come on 'til 4000 r's. They are considered to be unstreetable. So, I guess you could match the r's too that with the camshaft, say a Z303 and try that. GL. |
I'm no expert on crossrams but I would guess that with 900cfm of vacuum secondary carbs your gonna need quite a bit of the ol' RPMs to get much use out of the 2nd half of the carbs. Maybe someone can give a rebuttal of more experience or carb education:p
|
i was thinking the 450s are to big. maybe 390s?? I dont have the distributor but there is one on the market i found that will work. compression is 10.5 to 1. I should also put any information anyone has on this would help me out a ton, how many were made, what year its from, ect. I know nothing about it other than it looks cool, its NOS and i think it will fit under my hood without having to cut anything. Im trying to keep my comet somewhat b/fx style
|
At 10800 rpm and 100% VE (not likely) a 289 would suck in 900 CFM.
At a more realistic 80% VE your looking at 13,500 rpm. You need the smallest carbs you can find, in my opinion. |
That's kinda where I was headed with my thinking. I wasn't sure if a Cross Ram such as the one pictured would create any sort of situation to where an increase in vacuum might pull the secondaries open. I am fairly familiar with Carbs & manifolds but really haven't run any manifold similar to the one pictured.
|
I'll pipe in on the crossram style manifold and in particular the Smoke Ram SY1 from Edlebrock on a '69 Z/28 302 in a '67 Vette. 700 double pumper, stock Z/28 solid cam, 11:1, angle-port fuelie heads, 1 3/4" headers, 4-speed, 3.23 gears 3,150 pounds. Just to set the stage.
The coolest combination I have ever run. 7,000 rpm and more, good bottom end power and worked all through the rpm curve from about 2,500 and up. If I could run this style manifold on my SB 427 I would in a heartbeat. Size the carbs properly and ROCK. Would be way cool. If it fit on a 9.5" deck height 351 I'd tell you how horrible it would be and offer to buy it just to take it off your hands. Run it with the right carbs and enjoy. Jim 1855 |
Hey if your interested in some help contact me via PM. I have a friend that has vast knowledge of these intakes. He is willing to lend some info. I remember this same type thread last year. He can get you in the direction you want. Let me know. Matt
|
A flat ram is an underhood version of a Tunnel Ram. The dream is volumetric efficiency will go over 100 percent with the tuned length runner. I would keep the carbs that are on it and use them initially.
|
what does the inside of the plenum look like
is it separated down the middle...two halves, or all open inside if all open, then carbs too big, if divided, then only one primary set feeding half the engine...gets you into weber-think...one throttle body per cylinder instead of all venturi available for all cylinders like a 4v intake. what'll wake that intake, and the engine it's attached to, up, is displacement. bore and stroke the bejebus out of it. |
Quote:
|
2 Attachment(s)
Quote:
|
| All times are GMT -7. The time now is 11:01 PM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: