What is the intake restrictor?

[ksmike]

I have seen in some past threads reference to an intake restrictor. Where year Big Dogs had them in them? Im curious to what they look like, a pic of one would be nice. Are they something like the restrictor plates that nascar uses?

Inquiring minds want to know.

 

[stlmikie]

Yes they are similar. I know for sure they came on the 05 with the e carb. But I have no photos.

 

[woodbutcher]

in the '05 EPA motor they used smaller valves and a super "E" carb (less fuel flow). when the intake manifold was mounted to the cylinders, they put what looked like an extra metal gasket with the inside hole smaller than the manifold and the mating hole in the cylinder which basically throttled down and disrupted the flow of fuel into the motor. these can either be done away with completely by finding a manifold the right length to make up the difference of the now missing restrictor plate or you can simply have the inside diameter milled to match the I.D. of the manifold and put it back in where it was. either way, you still have to contend with the undersized valves. you see where this is headed? it is an entire chain of events that have to happen to get the EPA motor to breath like it should so it will pick up about 8-10 hp.

hope this helps, most of the info has been picked up from other posts/threads on this forum.

 

[ksmike]

in the '05 EPA motor they used smaller valves and a super "E" carb (less fuel flow). when the intake manifold was mounted to the cylinders, they put what looked like an extra metal gasket with the inside hole smaller than the manifold and the mating hole in the cylinder which basically throttled down and disrupted the flow of fuel into the motor. these can either be done away with completely by finding a manifold the right length to make up the difference of the now missing restrictor plate or you can simply have the inside diameter milled to match the I.D. of the manifold and put it back in where it was. either way, you still have to contend with the undersized valves. you see where this is headed? it is an entire chain of events that have to happen to get the EPA motor to breath like it should so it will pick up about 8-10 hp.

hope this helps, most of the info has been picked up from other posts/threads on this forum.

Ok, so it sounds like the 05 motor was the only year it was used on.......thanks for the clarification:up:.

 

[05 old dog]

o5 and early 06...

 

[ksmike]

Ok , looks like one less thing I have to worry about changing. I went back and did a search and found a picture of one. Thank to all for the clarification. :up: