jdm b18cR over reved on a shift

f4talintegra

New Member
Hi guys I have a 99 gsr with a jdm b18c R I was taking it out for a ride yesterday and was unfortunately throwing gears for the track to make sure she wasn't looking any power and was running at peak and I was running it about 8500 rpms well unfortunately I went to shift to 4 and it just shot the rpms way up thought I missed the shift but wen I looked at the rpms they wer probably about at 12000 although I do have stock ecu and engine just exhaust and cold air and rev limit at 8900 or around Ther I should say Idk how this happen mayb engine torqued into 2 instead of 4th? It wouldn't go into gear for min after this happen had to shut it down for min. Can any one help it will not idle now and I have to give it gas while starting to get it to fire up but won't stay running unless I'm on the gas pedal at first it would start and idle would just bounce like it couldn't keep the idle I drove it for like a block and then it wouldn't keep idle no more and would just die now its jumpy at steady speed but still feels like it has some power behind it can any one help?
 

bkirshr

User that is Registered
I'm not sure about your problem, but this was almost impossible to read. Use punctuation, dude.
 

jcspiegel

New Member
Mechanical overrev

Most likely you over-revved the engine enough to bend the valves - either the timing belt slipped or you floated them into contact with the pistons.
 

Muckman

Not a M0derator
You def bent valves. You'll need to pull the head to replace the valves. I would recommend a new complete set of valves, aftermarket or OEM. Great time to upgrade the valvetrain. You'll want to replace the head gasket, tbelt, water pump too.
 

Nick_C78

New Member
I agree. Classic case of missing 4th and going in to 2nd, causing bent valves. You also probably stretched your timing belt, so do not reuse it. Basically, do what Muckman just said.
 

99TegLs

Senior Member
Ahh, to be young and mis-shift again. You learn after your first head rebuild to be more careful. Stinks OP
 


Nick_C78

New Member
OP, do you have a short shifter? If so which one? I had a B&M that made mis-shifting incredibly easy. I have since gone back to OEM and have never been happier.
 

f4talintegra

New Member
Ok thanks guys that's what I thought and no short shifter. I did however look again and I got a couple bad motor mounts wonder if that help with it at all? I no a bad shift but I didn't think it would easily go into 2nd going that fast, and sry guys I was in a hurry to post it plus was up all night and had school in morning thanks tho guys! I just hope its the head and nothing els!
 

Nick_C78

New Member
If the clutch is in and working properly it will go in to every gear easily no matter what your speed is...
 

f4talintegra

New Member
Now would it matter if I got valves for the b18c1 usdm gsr motor, or do they need to b for the jdm b18c R motor I think they have same head just different valves but I'm not for sure? Thers very lil info on these engines I just no most, but when it gets into the build of the motor I dnt no Mich doing more research on it tonight...
 

Nick_C78

New Member
A B18C Type R motor actually uses a b16 head, not the same head as the C1 GSR. Also I believe the ITR has lighter valves than the GSR even though they share the same face size. The other difference is the stem size, which I think is why the ITR valves are lighter. I also think the type R has different valve angles. That being said make sure you use matching valves! A balanced valve train is very, very, VERY important.
 
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f4talintegra

New Member
So ig now where to start? I have valve cover pulled, and I will have head pulled tomaro. Hoping that's its just bent valves cylinder 1 had no compression when I checked and cylinder 2 had perfect compression! Should I put stock itr valves back in and be done, or should I machine head put lil bit bigger, and stronger valves in? Mayb I should go all the way, and get cams, and valves but trying to stay away from tunning computer no shops around here to do that and no hondata? I was wondering if I can get mild cams with mayb more aggressive vtech and not have to tune it? sry guys kinda a nube at this!
 

Muckman

Not a M0derator
Since you're new at this and you don't want to retune then just replace the valves in the bad cylinders with OEM valves.
 

Nick_C78

New Member
Not to be rude, but you don't have enough experience to think about building it yet. Just take the head to a machine shop and get it checked out. Then depending on how many valves are bad order that many. Order OEM type R ones and just repair whats wrong with the head. Youll likely need new guides and valve seals too.
 
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