robs_seven

iTrader: (1)

Well not driven my car in about a month, had some issues but i just started it up and took it for about a 10 minute drive. The whole time the temps were good on my mech gauges and everything seemed fine but.....

Well the whole time it felt like it was serging and backfiring, and also when i parked it at home and popped the hood there was smoke or heat comeing from under the car and up the firewall, could this be just the header and exhaust. it was not red and the water was 180 and oil pressure was nice. so could this be i was dumping too much or not enough fuel in the car, or the timing or C all the above. Also can this cause probs to my car, never had the exhaust do that some im a little worried. I read some past articles but still not completely clear. thanks

aussiesmg

iTrader: (1)

You may have a blocked muffler, baffles do come loose from time to time, this would restrict flow and stop heat from escaping.

robs_seven

iTrader: (1)

i checked and i can feel strong pressure coming out the muffler plus its a new rb exhaust (not brand new but with in the last year)

steve84GS TII

All kinds of critters and gunk can accumulate on an unused car,and with the rotaries hot exhaust,its gonna burn and bake the stuff off after a few minutes of running.
The timing shouldnt change ever unless you have a 79 w/points.
RB mufflers dont have baffles and arent known for blowing out either.
A month is long enough for our crappy modern gas to start breaking down and sludging the carb up.Especially if its humid out and your gas tank is left near empty.Its always best to keep the tank full and a little Stabil cant hurt either if your gonna store or not drive for a while.
It might just need some fresh gas and a good goosing to clear things up.Dont baby it during the 10 minute drives,especially if your just gonna turn it back off and not drive for another month.

robs_seven

iTrader: (1)

well i would like to drive it every day, and i had been for a while. then i decided to put in a e fan and my probs started, now im just getting it back on the road so if i can get it right i will drive it ALOT. so will this hot exhaust cause problems to my motor???? thanks

steve84GS TII

Dunno.
The only way to really know if the exhaust is too hot is to take a temp reading. A handheld temp reader might work,although rotaries get pretty damn hot down there.I have a reader I use for tuning my nitro RC cars and I tried it once on my TII engine which regularly glows its exhaust system dull red.When I shoot my turbo,the reader goes nuts.
If its not glowing,then Id say its not too hot.And as stated before,it sounds like you have an exhaust system that not prone to collapsing or clogging.
If it is hotter than normal (which is pretty hot for rotaries) it could be a bad set of plugs or wires,rich fuel mixture or possbily retarded timing.

Kentetsu

Sounds like you might have lost your leading ignition. This would cover the surging, backfiring, and hot exhaust/smoke. Pull a leading plug and see if you still have spark.

steve84GS TII

Not to mention kill your power!
Its a very likely possibility,considering the frailty of the stock ignitors.You arent running your direct fire setup off the stock 1st gen ignitor right?
An MSD6 box is a much better candidate for leading ignition duties.

robs_seven

iTrader: (1)

i have the 2nd gen coil system. i took out the plugs and they seemed a bit dirty, i put them back in and i still think my mixture and timing may be of. I will work on it some more tommorow but i think its just going to take some messing with but eventuallly it should be back to normal.

Kentetsu

Did you make sure that you had spark when you took out the leading plugs?

robs_seven

iTrader: (1)

i first thought they were not sparking so i took them out cleaned them and then layed them on the hood and they had blue spark. they are 2nd gen plugs and seem to ge working well

Kentetsu

Well, rotories have very hot exhaust gasses by nature (which is why exhaust systems are so much $$$). As long as your timing is set correctly, I wouldn't worry about it...