Thread: dropped a valve in 3 diff motors what am i doing wrong PLEASE HELP

its a custom manifold with q45 throttle body and the screws on it were welded on to the shaft same manifold ive been ussing after the engine start

No... I do. Keepers not seating is about only way for it to drop that quick. Unless you are complete tard and not timing the motor right then forcing it to run/eat itself. There isn't any magic to this.

the keepers were installed properly i can assure that and yes the car was on timing at all times

You're on to something. Retainers that aren't designed properly with the right CONICAL ANGLE cut into the retainer for the keepers to sit will cause the valve drop, after it gets beaten and loosened up since the keepers are not searing properly in the retainer. I think the problem is the keepers after hearing all the items that were ruled out. Get new keepers that fit with the retainers.

Not only the angle that seats into the retainer, but the groove in the valve stem and the catch on the inside of the keeper need to be good and ENGAGED. But I'm just a retarded engineer.

Cool then you didn't drop a valve.

ok let me point out that the motor thats i built i installed the keeper correctly bought super tech keepers for supertech oversize valves supertech bronze guides and supertech v/r

the other motor was using oem valve and oem keepers on super v/r

n the other i bought stock spring and retainers keepers were never removed with n1 cam

i understand what ur trying to say about the keepers not being seated properly but i can assure they were and if ur trying to make me look dumb am ase certified been on the field 10 yr now am working with vvl motor trying to figure out other peps mistake by me trying it as well now that the service manual doesnt tell me why my valve keep dropping on idle thats why i ask here

people on here dont need to be disrespectful about they answere or reply just cuz u know the answere doesnt make u any better or smarter this a community to help sr20 fans if u wanna comment out of place go somewhere else and be disrespectful

the valve came in contact with the piston and is dropped i pulle dthe stem out ans the valve just siiting on top of the piston i replace all 4 valves and now am ready to do it over today ive clayed the pistom amd head to see my clearance and yes my clearance still acceptable for when heat is applyed now am see what else before i fire it up tomorow

are you dropping the same valve everytime? or is it different valves? same cylinder, not the same cylinder. i am just curious i too thought it would be the keepers from improper installation except the last one obviously but u say its not so.

so to solve this problem we need to find out exactly what is exactly the same with all your set ups? these pistons you have is the angle of the valve relief correct? they are oversized pistons and valves so who knows. you say you clayed the motor did you do this with the cams locked in vvl?

i am just trying to give you things to think about, you have to think about all thats possible or relating to the situation