Is this intake any good?
#1
Is this intake any good?
Does any one know if the Offenhauser Intake #5822 (Square-bore) is any good for performance? It is a flat looking intake and says offenhauser 360 on it. My brother has this intake on his 71 cutlass. The car has a rebuilt 1970 engine with #6 heads and a mild cam. He says he cannot spin the tires and that the car does not feel as fast as it should be. The car also has 600 cfm Edelbrock carb with electric choke. Do you think the intake is hurting performance or maybe the carb is the problem?
#2
I doubt the intake is at fault,they are simple in operation,
As long as it's dual plane and the rpm matches the engine output.
If its a single plane manifold they come alive about 3000 rpm.
I'm guessing if he is using the stock carb,it may need too be re jetted or tuned.
I was inspecting my new manifold,and the carb plenum is at least twice the size as the stock intake.
Vacuum secondaries will adjust fuel flow per airflow,but the carb may now be too small.
As long as it's dual plane and the rpm matches the engine output.
If its a single plane manifold they come alive about 3000 rpm.
I'm guessing if he is using the stock carb,it may need too be re jetted or tuned.
I was inspecting my new manifold,and the carb plenum is at least twice the size as the stock intake.
Vacuum secondaries will adjust fuel flow per airflow,but the carb may now be too small.
#4
#6
So it sounds like that intake might not be good for performance. Do you think that carb is a good match for that engine. I am under the impression that the 600 cfm Edelbrock carb was made more for fuel economy than performance.
#7
What gear is in it? And that small carb, in theory, should make it more responsive not less.
#9
Single plane intakes have one large plenum and feed all 8 cylinders through it.
Low end suffers,but once the motor is turning some rpm,performance should be better.
Low compression,stock rear and converter,and city driving all add up to a uninspiring experience.
Low end suffers,but once the motor is turning some rpm,performance should be better.
Low compression,stock rear and converter,and city driving all add up to a uninspiring experience.
#12
If you don't have much money and you find one cheap they allow you to bolt on a Holley carb and they work fine, just not optimally.
#13
Sorry, but you are confusing the Offy 180 with the Offy 360. The 360 is a single plane manifold, period. The Offy 180 is the hybrid you are thinking of. That manifold was essentially two single plane intakes stacked one on top the other. On the 180 intake, the upper single plane intake was fed by the primary side of the carb and the lower was fed by the secondary side.
#15
Sorry, but you are confusing the Offy 180 with the Offy 360. The 360 is a single plane manifold, period. The Offy 180 is the hybrid you are thinking of. That manifold was essentially two single plane intakes stacked one on top the other. On the 180 intake, the upper single plane intake was fed by the primary side of the carb and the lower was fed by the secondary side.
That goofy look dual port manifold was called the Dual Port not the 180.
I realize you know a lot but you don't know everything.
#16
Not true, it is all about the combination. My wife had a 77 Supreme (heavy at 4100 lbs) with a mild 350 and 2.41s and it would roast the tires. Same for my G-body with a 355 which had a similar, if not higher, gear.
Last edited by captjim; May 23rd, 2012 at 06:15 PM.
#17
A 3 foot skid after a neutral drop is not roasting tires. I know enough to know what you just alleged is not likely. If you are suggesting that he should do anything but change the rear axle ratio you are wasting his time and potentially his money.
#18
The RPM Of engine,cam and torque converter can be made to smoke the tires pretty good,if they are matched.
The car just wont have any top end.
The offy photo does show how modified intake ports can be tailored,but it's still feeding only one cylinder,probably just to smooth the airflow.
How about a plenum photo?
A carb spacer should make for better performance,if you have the hood clearance.
The car just wont have any top end.
The offy photo does show how modified intake ports can be tailored,but it's still feeding only one cylinder,probably just to smooth the airflow.
How about a plenum photo?
A carb spacer should make for better performance,if you have the hood clearance.
#20
Calling me a liar? I promise you both cars would fry them from an idle. I did not suggest he do anything, I just disagree with your statement.
#21
Here is a regular Offy 360 deg. as Joe P described:
http://www.ebay.com/itm/Offenhauser-...item2a1778b04e
and here is an Offy "dual port"
http://www.ebay.com/itm/offenhauser-...item43b0137c33
another 360 dual port:
http://www.ebay.com/itm/Offenhauser-...item53eb646e0f
here was an article on the Offy 360 dual port:
http://www.ebay.com/itm/HOT-ROD-MARC...item231626d629
I don't recall Offy advertising their dual ports as 180's
http://www.ebay.com/itm/Offenhauser-...item2a1778b04e
and here is an Offy "dual port"
http://www.ebay.com/itm/offenhauser-...item43b0137c33
another 360 dual port:
http://www.ebay.com/itm/Offenhauser-...item53eb646e0f
here was an article on the Offy 360 dual port:
http://www.ebay.com/itm/HOT-ROD-MARC...item231626d629
I don't recall Offy advertising their dual ports as 180's
#22
He is going to be replacing the offenhauser intake with a better intake. Most likely he will get a edelbrock performer intake for it. His car also has a high compression engine so it should be faster that what it currently is. Even my 71 cutlass with a stock engine and 2.73 gears will spin the tires from a stop.
#24
#25
will a performer rpm respond well with stock everything except headers and exhaust? its my daily driver and want to squeeze as much as i can out if it with bolt ons. future plans include eddy 600, HEI, Converter, posi, then later on I'm going for the whole RPM kit w/ aluminum heads port matched to my intake
#26
For your application, just find a pre-egr stock quadrajet intake (1966-72 model years). Cheap, seals easily to the heads with the stock gasket. I doubt you will feel or get any noticeable gain from an aftermarket intake.
#27
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