My 426 is quieter than my 400 was??

[carlj75]

I put it all together with a JE 11:1 426 piston and a stage 2 hotcam. Should it be quieter than the stock motor? It sounds deeper but not quite as loud. I would think that with bumping up the compression and putting in a bigger cam it would make it a little louder. Did I do something wrong or do they all do this?

sounds like you did something right if it is running good.

[carlj75]

Yeah, maybe the longer lift duration of the cam will quiet it down a little. Any thoughts??

[canadian400ex]

Did you make any other changes at the same time as your rebuild? Sounds like maybe you are running with no air-box lid now.

[carlj75]

The only other changes I made was removing the choke and putting in a #42 pilot jet. I have always had the airbox lid off.

[skemp]

The difference you are hearing is probably just a deeper exhaust tone. Letting a motor flow more freely, and efficiently can make it run quieter as well. When I got a full exhaust, FCR, and did race porting, my quad was a lot quieter. It is very deep sounding now, unlike my WB E-series that just screamed.

[RAPTORAZ]

skemp hit it right on. Engine efficiency tends to quiet an engine down. Ever notice how Fuel Injected Turbo cars seem pretty quiet in comparison to a big cammed carbureted engine? My Raptor is definately quieter now, with the 727, than it was when the motor was stock(but piped).

[carlj75]

OK cool, thanks guys.