If so, which cylinder?

I have a hunch

Please don't vote for hydrolock.


Modified by SMSP at 8:43 PM 2/9/2005

 

is this hunch related to your H1 motor? and are you going to be ready for VIR?

 

Thrown a rod? As in broken or tossed completely out of the motor?

Are you also including events that involved damaged rod bearings, but nothing else more serious?

 

I don't remember exactly which one is was, but a customer brought in a GSR with a hole in the block, and it was either #2 or #3 one of the middle ones. This was a completely stock B18C1 running 100 shot of Nitrous.

And it snapped off towards the bottom and most of it wasn't found inside the motor... so most of it probably flew out of the block (front (header) side)

 

I've broken an Eagle rod and shot it out of the block...cylinder #3.

 

Hmm, so far all of the votes are for #3.

 

dave, always #3 and rods always throw out of the same spot of the front and back of the block ... you should ask for pics too ...


greg

 

#3, Who cares about the rod! Thank God nothing happened to the SMS header!

Shameless plug for my buddy Dave

 

Can we say HYDRO-LOCK... that was my first experience
Science 101
H 2 O + CAI + Florida = hydrolock

 

it's always #3 now someone go figure out why #3 and find a solution thanks ... :D

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by XtraFastCRX &raquo;</TD></TR><TR><TD CLASS="quote">it's always #3 now someone go figure out why #3 and find a solution thanks ... :D</TD></TR></TABLE>

Well this is helping to prove my hunch. There are a couple of solutions, I'm just looking into the cheapest way to do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SMSP &raquo;</TD></TR><TR><TD CLASS="quote">

Well this is helping to prove my hunch. There are a couple of solutions, I'm just looking into the cheapest way to do it.</TD></TR></TABLE>

What are the possible solutions?

 

One first has to know why its usually #3 that fails.

Think out loud.

What are some of the causes of rod failure?

 

Oil starvation...(bearings) #3 is also the hottest cylinder, but I'm not sure if that matters much in respect to the rod.

 

poor bearing clearance? improper/weak rod bolts?

 

I'm thinking that it might be #3 because of the way the crank dynamics are working. Try and understand my thinking here (Im thinking out loud, so this might come out weird) There is more support on #'s 1&2 from the tranny/flywheel... #3 is right at the end of the girdle (GSR/ITR motors) with the only support coming from the main cap... then #4 has the crank pulley near it, and the oil pump close by so it's staying pretty harmonic....

i'll take a guess by saying the the crank might actually be vibrating more at #3, so thats what might be helping to cause the failure.

I think on an LS block this will be more common... but in my experience at the shop... only B18C1 GSR motors have this dillema.

 

my buddies gsr wrecked havoc on the #3 cylinder as well. punched half the sleeve out.

 

i threw a bearing in my B16 hence why i got the bad *** motor swap. not a rod, but put the engine out of comission just as well.

 

I have thrown a motor in 2 different motors, both on cylinder #3

 

Also doesn't honda give rod #3 different clearance specs, oh wait that the third main

 

I have to put my vote in on cyl #1 for me. I chewed up that rod bearing while auto-x'ing. All of the other bearings were fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IN VTEC &raquo;</TD></TR><TR><TD CLASS="quote">I have to put my vote in on cyl #1 for me. I chewed up that rod bearing while auto-x'ing. All of the other bearings were fine.</TD></TR></TABLE>

Must have been oil starvation.

 

The motor had a Mugen baffled pan and an oil pump with gerotors that clearanced out ok. It ran fine for 25k miles and ran several auto-x's over the last two years at the same site (similar course design every time), as well as drag racing occasionally and including one HPDE a couple months before the motor gave out.

The #1 rod is the closest to the oil pump output as well. I can see the #2 or #3 rod bearings having an oiling problem since they're only fed by one main journal each, but not the #1 rod.

 

Its very interesting that most of the occurences are with rod #3.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Digga4 &raquo;</TD></TR><TR><TD CLASS="quote">Can we say HYDRO-LOCK... that was my first experience
Science 101
H 2 O + CAI + Florida = hydrolock </TD></TR></TABLE>

I bought a 91 integra with the same problem Hydro-d only this one had a stock intake. Anyways Rebuilt that engine (same crank beleive it or not) and then 20K later I spun Rod #3 mine was def oil starvation.

I also built a LS motor and spun Rod#3 within 400 miles of rebuild. So I have two #3's.