Getting some things arrond to get some more parts in place. Ive got a new gen hemi, 5.7 based block machined so its 354ci. Looking to build a hilborn style intake for Stromberg 97s or holley 94s. I am going to send out an intake gasket set to have flanges made but I need a pattern for the carb plate if someone could help me out. These engines are allot more efficient then its predecessor and the heads flow well how long of a runner between the plates will I need? Who in the hotrod world could I send plans to local to the chicago area to have these flanges cut, or who do you suggest? What do you think of the whole idea?
I don't understand "Hilborn style intake for Stromberg 97s". Shouldn't be hare to find someone with a CNC torch, plasma, water jet cutter around where you are.
After I wrote the post I got in touch with Don, Pops29 and ive got a quote. Now on to the more technical end! Tunning each carb as there will be one per cylinder. How long will the runner need to be between each flang?
I guess what you are building is an Individual Runner intake. So that each cylinder runs as a single. I made such a manifold for a Howard head GMC some time ago. But I used 500 Holley two bbls. and one throat per cylinder. There are several Webber intakes that are very short and use the same principal. It sort of depends on the rpm you want it to be most efficient at. Short for high rpm. Long for lower.
Runner length depends on RPM range. You will have a very small wkindow with that type of a setup, like about 500-100 RPm that your engine will run effeciently. You will need to do one of two things, decide a runner length then build the engine around that RP:m range or build the engine and then decode your runner length based on the engine build. her is sometrhing to keep in mind, runner length general rule of thimb. longer = lower RPM and shorter = higher RPM. You can alter the effect with runner dia and taper, for instance one trick that the builders and tunners of tunnel ram intakes use is to start the runner larger and taper it down to the port, this increases port velocity and makes the intake perform with better manners. or so I have been told. You will be better off to build yourself a log type of intake, and then build a cross ram type of an intake with your runners for the left head reaching out to the right right log and vice versa. Runner length in the 10-12 inch range will do. It won't be perfect but it will ball park you.
Yes one carb per cylinder. There is one company out there that makes an intake for Webber carbs, called ir intakes specifically for my engine but there over a grand and they are bill it. I just don't want that look nor to spend that kind of money so I decided I'd make one out of steel fore Stromberg's. I'd like to be able to drive this thing on the street, I'm not building a race car. So a good low to mid range rpm level will be were I'd like it at.
I found on my GMC that by adding stacks to the carburetors to contain the reversion cloud that formed above them, I could sort of tune the rpm range. But I only cared about WOT. I would agree with the cross ram log manifold. But maybe you want an IR. Fine with me. Go for it.
"In any conflict between Physics and Style, Physics always wins" sorry, that's just the way it is..........you are free to determine your own method and level of compromise.........
Bob Ream at imagine injection has done hilborn-style efi intakes for late model hemi motors. He may be able to adapt something to your needs http://www.imagineinjection.com Posted using the Full Custom H.A.M.B. App!
I just remembered. In the 60s Wieand (I think) made an IR manifold that was 8 cast aluminum elbows to mount Strombergs on a Chrysler. Of course this was for fuel motors. But you never can tell. Maybe you could find one somewhere.
Using a modern engine because its what I have.... Using dtrombergs because they are cheaper than any fuel injection system for it. Plus I'm building a hot rod I'd like it to look the part.
Ray this whole physics thing is that a fancy way of saying that form follows function? I put a hood scoop on a Hillman once.
Most of us don't even read them any more but thanks for doing it anyway. You're multi carb idea is not a bad idea, you will find that unless you are a tunner and a good one that multi carbs not on a common plenum are a real pain. I am not saying that to rain on your parade ot even convince you not to do it. multi carbs look cool and 8 carbs look really cool, I am just being honest. As far as street brawlers are concerned, you seldom saw a hillborn or enderle or alogon setup run on the street. Stack injection has never been a street friendly setup There were a lot of fellas that tried running setups like you have mentioned and had good success, many more who did not. For a streeter that is not going to see mega revs on a constant basis you are going to want to keep your runners longish for drivabilities sake. Not long like field goal long but longer then 1st and goal if you catch my drift. There is another solution that is going to look every bit as bad ***, easier to tune and no doubt more drivable. 2 4s on a low to medium rise intake is a viable option. I am just giving you options and nothing else.
This is another example of what im talking about. Hope these two picks bring whats in my head to sense
Im hearing you loud and clear! I was looking at some build your own intake set ups from a company. I contacted them and he explained to me that he was so busy with his current traditional engine designs and customers and simply didn't have the time to take on this project. He gave me the correct people to get into contact with that can make me a set of intake flanges and stromberg flanges so that the carbs line up directly with each cylinder. Sounds like i have some more homework to do. Thanks for the heads up!
Well what you have pictured is a log manifold and not an IR setup. So I am confused. But I got thinking you were using a "56 354. I forgot it's a late engine. So forget the Weiand manifold.
Ok, so how does an 8x2 log intake perform? Could it be reasonably fabricated for the use I'm describing?
Several manufacturers sold cast aluminum manifolds for the old hemi that mounted 8 97s. But again, these were used on top fuel cars of the time. I just looked in the Summit catalog and eight new 97s will set you back $3600+. Just the carbs. For that kind of money I would be calling Hilborn about a stack EFI deal. But if you want to go ahead, do you have a pattern or drawing of the flange you need? What thickness do you want it cut from and how much are you thinking of paying? I have made flanges for intake and exhaust manifolds before. Custom parts cost $$$$.
I was already quoted less than 300 for both intake flanges made of 3/8" p & o and both flanges with the stromberg base with all 8 on the same flange centered on each intake port made from 1/4" p & o. I hear you the carbs new are insane but they are looking to be easy to come buy on ebay they will need rebuilt but that is my way of learning those carbs.
I imagine my posts here come across as a 'naysayer'....but I prefer to think of myself as a realist. The drivability is where I think the trouble lives, and the great looks will only make that even more frustrating. Starting with old, worn out carbs, that weren't REALLY all that good when new, is only going to make your task more difficult. Some of the new reproduction 97's (98's ) have improved innards, or so they claim. In any case, best wishes and I hope my caution is proven wrong.
Or if I was a rich kid I'd pick this up http://www.jegs.com/p/Mopar-Perform...e-Gen-III-Hemi-Timing-Covers/2340109/10002/-1
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