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Won't pass 5k when hot!!
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57 Rag
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PostPosted: Tue Mar 17, 2015 11:08 pm    Post subject: Won't pass 5k when hot!! Reply with quote

What's up!!! It's been awhile but been busy as hell. Anyway I got a new problem and not sure where to start. I'm thinking ignition. Anyway when I start my car kinda feels like it's running on 2 cylinders until it warms up then fine. That's no big deal. Car runs like a bat outta hell but after driving for awhile, like when it gets hit engine won't pull past 5k and backfires. I have a Petronix on an 010. Any ideas? Lean maybe?
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rrcade
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PostPosted: Sat Mar 21, 2015 2:02 pm    Post subject: Reply with quote

How hot is HOT? Do you have cylinder head and oil temp gauges?
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Dr OnHolliday
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PostPosted: Sat Mar 21, 2015 2:13 pm    Post subject: Reply with quote

Increased friction due to smaller clearances from heat growth of parts? Hot valve (s) sluggish in closing or sticking?
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Casting Timmy
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PostPosted: Sat Mar 21, 2015 7:08 pm    Post subject: Reply with quote

Did it ever run okay? is it the motor in your sig line?

If it still runs, just not over 5k when hot and use to always run good i would start checking my fuel system out. Maybe its starving for fuel???

You can also pull over and see how hot your dip stick gets. Just to get an idea if you are overheating or not.

Kadrons can idle on two cylinders if you don't increase the manifold plenum, just learned that fix from Bruce's comment on another thread. Dual dual carbs... make sure idle jets aren't clogged. If its been sitting a while I would be tempted to take off the carb, or carbs and clean them.
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sturgeongeneral
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PostPosted: Sun Mar 22, 2015 1:05 pm    Post subject: Reply with quote

With having BOTH warm up and hot issues I would first try swapping the distributor. What is your fuel pressure?
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kamesama980
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PostPosted: Mon Mar 23, 2015 1:33 pm    Post subject: Reply with quote

Don't forget the possibility of multiple independent problems. one causing the low rpm problem, something completely different causing the other. Start with the usual valve clearance and timing. check timing cold, when it's running good, and hot enough to not be running right.
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PostPosted: Mon Mar 23, 2015 2:27 pm    Post subject: Reply with quote

Wierd stuff happens when u dont drive it often. Check main stack for obstructions and test your coil. If its a blue bosch 3 ohm check. Lastly, check rotor seat. Sometimes they wear inside and dont seat.
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smkn_vw
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PostPosted: Mon Mar 23, 2015 2:46 pm    Post subject: Reply with quote

57 Rag wrote:
I'm thinking ignition . . . and backfires

Tighten down the Pertronix and you'll be back over 5K.
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57 Rag
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PostPosted: Wed Apr 01, 2015 11:49 pm    Post subject: Reply with quote

Sorry guys, I appreciate ur input. I didn't ignore u guys just had some stuff happen.

rrcade. Yes temp never gets above 230.

Dr.... Set valves .002 when warm

Timmy. Motor runs awesome and fuel pressure at 3.5. Only recently its been acting up
Don't think its jets cause it runs fine till warmed up. I can nail it and it fly's. But cruise for about 30 min and it falls flat at 5k

Kame. Checked valves And timing. All good

Jfats. Good idea. Emma check the rotor. Its a petronix flamethrower coil

Smkn. I hope ur right lol

Thanks guys
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vwsb74
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PostPosted: Thu Apr 02, 2015 11:58 pm    Post subject: Reply with quote

57 Rag wrote:
Sorry guys, I appreciate ur input. I didn't ignore u guys just had some stuff happen.

rrcade. Yes temp never gets above 230.

Dr.... Set valves .002 when warm

Timmy. Motor runs awesome and fuel pressure at 3.5. Only recently its been acting up
Don't think its jets cause it runs fine till warmed up. I can nail it and it fly's. But cruise for about 30 min and it falls flat at 5k

Kame. Checked valves And timing. All good

Jfats. Good idea. Emma check the rotor. Its a petronix flamethrower coil

Smkn. I hope ur right lol

Thanks guys


Change your spark plugs and coil Wink
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smkn_vw
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PostPosted: Fri Apr 03, 2015 10:19 am    Post subject: Reply with quote

vwsb74 wrote:
Change your spark plugs and coil Wink

Good suggestion...the hot coil syndrome running out of steam. If running rich at top end and using a Blue coil possibly not getting hot enough spark to burn fouling and jump gap and resulting in lots of misfire ie. no juice to get over 5K rpm's.

Slap in a 50KV coil if you're running something smaller and some well shielded plug wires and call it good.
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beachbuggy61
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PostPosted: Mon Apr 06, 2015 12:53 am    Post subject: Reply with quote

I had a very similar issue at 6250rpm. Coughing and backfiring. I run injection and MS2 ignition. It felt like the rev limiter was cutting in.

Tried ignition, fuel pressure, the lot.

Turned out to be valve float. Fixed the valve springs = revs!!
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