engine problem need advice HELP !
Thread Starter
Racer
Joined: Apr 2005
Posts: 465
Likes: 1
From: FRANCE (Lyon)
engine problem need advice HELP !
A fiend has a problem with his engine !
-Engine:
350ci L48 from a corvette
8.5 CR (stock piston and rods)
-Cylinder head:
stock cylinder head
valve new
polished intake and exhaust port
-Camshaft:
LUNATI Voodoo Part #: 60102LK
Duration @ .050 IN/EX: 219/227
Valve Lift IN/EX: .468"/.489"
LSA / ICL: 112/108
lifters LUNATI
pushrod LUNATI (same length than stock)
rocker ratio 1.5 SUMMIT Part #: SUM-141506
-Carb:
Qjet from an runnig engine
fuel pump new
Troubles
--> only 3 or 4 cylindre seem to run (exhaust hot temp)
--> engine move a lot (normal if cylinder are missing)
--> ingnition seems to be ok (spark appear)
--> with rocker in place we don't feel pressure when we place our finger on sparkplug hole and we rev engine with starter
--> but with rocker remove we have pressure!
hope i'm clear ! any advice will be great !!! sorry for my english
-Engine:
350ci L48 from a corvette
8.5 CR (stock piston and rods)
-Cylinder head:
stock cylinder head
valve new
polished intake and exhaust port
-Camshaft:
LUNATI Voodoo Part #: 60102LK
Duration @ .050 IN/EX: 219/227
Valve Lift IN/EX: .468"/.489"
LSA / ICL: 112/108
lifters LUNATI
pushrod LUNATI (same length than stock)
rocker ratio 1.5 SUMMIT Part #: SUM-141506
-Carb:
Qjet from an runnig engine
fuel pump new
Troubles
--> only 3 or 4 cylindre seem to run (exhaust hot temp)
--> engine move a lot (normal if cylinder are missing)
--> ingnition seems to be ok (spark appear)
--> with rocker in place we don't feel pressure when we place our finger on sparkplug hole and we rev engine with starter
--> but with rocker remove we have pressure!
hope i'm clear ! any advice will be great !!! sorry for my english
Thread Starter
Racer
Joined: Apr 2005
Posts: 465
Likes: 1
From: FRANCE (Lyon)
but we make 2 time the adustement!
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
What leads me to believe some valves are too tight is that you said you get compression with the rockers off on cylinders that you couldn`t with your adjustment by spinning it with the starter. If you hook up your ignition you may get a backfire in the carb if a intake is too tight.
