STOPS pulling hard after 3800 RPM????
#32
i garuntee you its not valve float he has more money in his head than most people do in there trucks.
Money does not buy any guarantees when it comes to performance parts.When you factor in outer orbit rpms,cam twist and the motors having long push-rods,flat tappets and archaic rocker/rocker stands valve float will kill HP and it will not be regained.
Brandon...
Explain to me how engine load effects fueling in a 12v.One would think,since the P-Pump is gear driven,that load would have zero issue with fuel delivery if your still still able to run the rpms you do.If your able to pull fuel to 3800 freely and the truck drops like a stone above it then its either a fuel supply issue or a case of valve float.It doesn't matter if your a puller or a dyno truck,valve float kills hp and parts,it has no friends.......Andy
#33
Registered User
Thread Starter
Join Date: Jan 2007
Location: Beavercreek,OH
Posts: 512
Likes: 0
Received 0 Likes
on
0 Posts
I NEVER once said it had any relation to fueling on a 12V, I just thought that if I had the weight of a sled behind me it would keep me from leaving the trucks comfort range which would net the proper fueling, I also talked to a few respectable pullers who said 12MM Pumps leave their comfort range near or around 4000RPM more suited for 13MM pump. Hammer you said on a dyno numbers fall fast above 3200RPM so their for anything over that is useless on a dyno?????????
Brandon
Brandon
#34
I also talked to a few respectable pullers who said 12MM Pumps leave their comfort range near or around 4000RPM more suited for 13MM pump.
Hammer you said on a dyno numbers fall fast above 3200RPM so their for anything over that is useless on a dyno?????????
I am still convinced after seeing a 5.9 on a engine dyno that the length+diameter of the camshaft+high rpms=cam twist and valve float.Long pushrods,flat tappets and agressive cam lobes do not help either.It happens in all internal combustion engines so why would our Cummins not follow suit?.Just some fuel for your thoughts......Andy
#35
Registered User
Thread Starter
Join Date: Jan 2007
Location: Beavercreek,OH
Posts: 512
Likes: 0
Received 0 Likes
on
0 Posts
OK I thought you were saying anything over this RPM they were falling off the chart not staying steady on their numbers. As I said I DO NOT rule out valve float!!! But we will see when I play with it a little more.
Brandon
Brandon
Thread
Thread Starter
Forum
Replies
Last Post