400 SEFI MA Build...
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From: Temperance,MI
400 SEFI MA Build...
Hey guys, I know I have posted about this before but, well seeing how its getting harder to find the eec-iv systems im doing my truck first.
Looking at bottem end I know I'm putting new rod bolts in, what about mains leave them if there good?
Valves I want to go stainless but don't know what ones? stem seals urathane? This is my first 335 series done windsors and sbcs, anything I should know? anything going to be a problem?
Thanks
Curtis
Looking at bottem end I know I'm putting new rod bolts in, what about mains leave them if there good?
Valves I want to go stainless but don't know what ones? stem seals urathane? This is my first 335 series done windsors and sbcs, anything I should know? anything going to be a problem?
Thanks
Curtis
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From: Temperance,MI
Cam is going to be a custom ground one from Cam Craft cams after seeing his work with the one for the 331 im really impressed.
Sequental electronic fuel injection running the adapters for the 302 intake to bolt up(5.0 truck) and running a A9L mustang computer, dont have to worry about the knock sensor the stangs dont run them, thermactors not worrying about them either it will code it but wont show it on the light.
Curtis
Sequental electronic fuel injection running the adapters for the 302 intake to bolt up(5.0 truck) and running a A9L mustang computer, dont have to worry about the knock sensor the stangs dont run them, thermactors not worrying about them either it will code it but wont show it on the light.
Curtis
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Simpler just going to run the EGR Edelbrock manifold have the bungs weleded in and use the 460 plenum and throttle body. The fuel rails are still unknown, 24lb injectors, matched maf sensor. Trying to figure out the tubes for the throttle body yet probibly going to end up making them out of fiberglass.
Curtis
Curtis
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From: Boise, Idaho
Originally Posted by 77_F150_4x4
... it's getting harder to find the EEC-IV systems I'm doing my truck first. Looking at bottom end I know I'm putting new rod bolts in, what about mains leave them if they're good? Valves; I want to go stainless but don't know what ones? stem seals? This is my first 335 series, anything I should know? Anything going to be a problem?
Bottom end, no particular issues there. There is a potential issue with the front cam bearing. If you're changing the cam bearings, you'll need to find a shop that deals with Clevelands to make sure the cam bearings get put right. There's an alignment problem due to Ford manufacturing techniques and the front cam bearing may need to be honed to line up with the other bearings. If this is not done, you may experience low oil pressure, or so I'm told. Since oil pressure is an issue with Cleveland type engines, this is something to worry about.
Are you going to use a roller cam? You'll need screw-in studs for the rockers.
I'd use hypereutectic pistons. I would even go to the trouble of machining in a custom dish to make quench and keep the compression reasonable. The dish should match the combustion chamber unless you're using open chamber heads. If you're using OC heads, you can use any piston that give the the CR you want.
I think you can use a 460 distributor to get the TFI setup.
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Thanks for the info on the cam bearings, yes it is going to be a full deal at the machine shop, I'm sure he has done them before hes been in the buisness for over 30 year. But I will still double check to be safe.
Roller cam I was going to go with but my cam guy talked me out of it due to the added power wasn't that much compared to the hyro flats.
The quench heads I have been thing about that wanting to do the lower compression pistons matched for the quench but that will probibly be around $500 a set so I'm looking at the Speed Pro H555CP @ 8.83:1 due to them being hyper. and they don't need tons of compression to make the power, and I would rather have a hyper piston over a cast piston.
Thanks
Curtis
Roller cam I was going to go with but my cam guy talked me out of it due to the added power wasn't that much compared to the hyro flats.
The quench heads I have been thing about that wanting to do the lower compression pistons matched for the quench but that will probibly be around $500 a set so I'm looking at the Speed Pro H555CP @ 8.83:1 due to them being hyper. and they don't need tons of compression to make the power, and I would rather have a hyper piston over a cast piston.
Thanks
Curtis
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From: Boise, Idaho
Curtis,
IANACE (I Am Not A Camshaft Engineer), however, with SEFI certain properties of roller camshafts become important. On my 5.0 HO SEFI in my 86 Mustang GT, I know the cam has a Lobe Seperation Angle of 114 degrees. One of the reasons for this wide LSA it so that the engine has a very strong vacuum signal for the computer to use.
Also, I agree that PEAK power can be the same for a roller and a flat-tappet cam, but the 'Area Under the Curve' for the torque is incredibly larger for the roller cam. In other words, low RPM torque is much bigger for a roller cam compared to a flat-tappet cam. I fell in love with my roller cam Mustang engine (200 hp and 24 mpg)and I'd use a roller even if I was going to go with a carb.
It's your call, but if you're wanting to use SEFI, I think you'll want a roller cam.
IANACE (I Am Not A Camshaft Engineer), however, with SEFI certain properties of roller camshafts become important. On my 5.0 HO SEFI in my 86 Mustang GT, I know the cam has a Lobe Seperation Angle of 114 degrees. One of the reasons for this wide LSA it so that the engine has a very strong vacuum signal for the computer to use.
Also, I agree that PEAK power can be the same for a roller and a flat-tappet cam, but the 'Area Under the Curve' for the torque is incredibly larger for the roller cam. In other words, low RPM torque is much bigger for a roller cam compared to a flat-tappet cam. I fell in love with my roller cam Mustang engine (200 hp and 24 mpg)and I'd use a roller even if I was going to go with a carb.
It's your call, but if you're wanting to use SEFI, I think you'll want a roller cam.
Last edited by pcmenten; Apr 22, 2005 at 04:17 PM. Reason: Fix a typo
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For speed density it has to be at least 113degrees of lobe seperation like on your 86 mustang speed density is very picky about alot of things. The cam I just put in the 331 I built for a 92 bronco(swapped 94 f150 SEFI MA computer and harness) has only 110 lobe seperation and it runs great the MA ones you can get away with less lobe seperation. Ill get ahold of my cam guy again see if he can get me some numbers and diffrences in them for non and roller set ups.
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