OS VZ .21 motor question
#1
OS VZ .21 motor question
Hello, I have a question concerning a Vz motor that I purchase. The guy I bought it from had a local motor guy hog out the sleeve. He ported it and ground grooves along side of sleeve. The motor runs STRONG... BUT... To make it run good on top end you have to lean it out to get it to clear out. Then it runs around the 300 deg range. If you richen it out to make it run cooler it wont clear out on top end. I run the A5 Os plug that Os recommends. Would a hotter plug work better with this engine? You also have to really lean out the low needle to make to come off the corners. Please HELP!! Thanks and have a great day... Patrick
#2
you talking about the vzb vspec? if so you need a P3 turbo plug the a5 is the wrong plug
#5
Nope, plugs are doing fine. It only has one copper head gasket on it, Would putting another help? Like I said it runs great when you lean it out a bit, still has descent smoke from exhaust but starts getting warm. Dont know how warm it will get because I shut it down before it gets to hot. Would like to get it running in top shape with nice temp so I can find it a new home. Not a OS fan. Course this OS motor may feel the same about me. I would rather have the Axial .28 motor instead. Hope someone can help or I will have to sell it as a parts motor that runs good. Yea sounds weird to me too.. Everyone have a wonderful weekend... Patrick
#7
BTW hows the pinch on the engine?
#8
If it runs well at 300f (idles ok, good response and smoke) then I bet your temp gun is not accurate. Most engines won't run well that hot, not for long anyway. I bet you have an aluminum shim on the head too, it is probably stuck to the head. If it's not there you must add it but you'd be losing plugs alot if it werent there. A5 is the best plug for that engine. Your best bet is to get a new piston and sleeve for it. The V-spec parts will fit perfectly.
#9
Hello, I usally dont buy used motors from people I dont know but the DEAL was really sweet. I bought a buggy from him and he just threw in the motor afterwards. He told me he could not get it to run so he gave it to me... I run small blocks with no problems, I rebuild and pinch them myself, this is my first Big block. I run the spektrum temp system so I am pretty good there. Just like havin min by min temp reading at radio. Even changed out to spare system to make sure. OK there. Pinch is great, real good compression, though it does have a little slack in bottom rod bushing, soon will need replaced. I messed with it again tonight and just for grins I put a MC59 HOT plug in it instead of the A5 (which I have tried 2 different ones) (does not foul plugs either). Started and run like a champ and cleared out nicely. Temp didnt get over 270 and I run it pretty hard. IS this NOT a good thing(again first BB)?? I will try putting the med plugs in it again tomorrow and see what happens.. I am thinking this all has something to do with the port job that that guy had done. Oh yea It has 1 copper looking shim. Thanks for all the input. Gonna sell off some of my small block stuff and to fund a NEW BIG BLOCK... Have a great weekend!!! Patrick
Last edited by slufoot78; 09-07-2007 at 08:22 PM.