Engine reverse stalling - Page 3 - HCS Snowmobile Forums


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Old 04-17-2017, 02:37 PM   #21 (permalink)
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I have 2 gauges currently one is a cheap Actron and the other is a $200 dollar Snap On unit and both read with in few pounds of each other. To compare my 64 Nova with a 11:1 compression engine will push the gauge to almost 200 psi and I am running that on pump gas. A typical car engine running 8.5:1 compression will produce about 145 - 160 so no at 155 psi you do not need race gas. Using the same gauges I would see about 134 on my F7.

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Old 04-17-2017, 02:48 PM   #22 (permalink)
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Quote:
Originally Posted by shimxtr1 View Post
I have 2 gauges currently one is a cheap Actron and the other is a $200 dollar Snap On unit and both read with in few pounds of each other. To compare my 64 Nova with a 11:1 compression engine will push the gauge to almost 200 psi and I am running that on pump gas. A typical car engine running 8.5:1 compression will produce about 145 - 160 so no at 155 psi you do not need race gas.
I'm afraid you are comparing apples to oranges. A typical high performance two stroke with tuned pipe is close to or past the safe zone for pump premium fuel at 155 psi unless timing is way retarded, or tuned pipe is poor design, IMO. The reason is the supercharging effect of the tuned pipe at peak torque rpm.

A four stroke on the other hand, can be at 200 psi and still run pump premium if cam timing is very mild (or radical) and ignition timing is not over advanced.
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Old 04-17-2017, 03:29 PM   #23 (permalink)
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Quote:
Originally Posted by shimxtr1 View Post
I have 2 gauges currently one is a cheap Actron and the other is a $200 dollar Snap On unit and both read with in few pounds of each other. To compare my 64 Nova with a 11:1 compression engine will push the gauge to almost 200 psi and I am running that on pump gas. A typical car engine running 8.5:1 compression will produce about 145 - 160 so no at 155 psi you do not need race gas. Using the same gauges I would see about 134 on my F7.
Definitely can't compare to 4-stroke.
Heck, polars has updated the head on certain motors to reduce compression because it was too high for the EPA tune, and that was 130 to 125.
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Old 04-19-2017, 11:19 PM   #24 (permalink)
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Verdict is in. Checked compression. Spinning with a power drill, 150 psi each side. The fix ended up being a magnetic pickup that was too far away from the flywheel. Of the 2 pickups, one is engine rpm, the other is crank position. But, one was noticeably farther away from the flywheel. Slotted the holes in the pickup and moved it in closer, problem solved. 30+ reverse/forward sequences. Never stalled once. Next time someone has their flywheel pulled, post up if your pickups measure equal distance away. I'm curious now.
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Old 04-20-2017, 12:13 AM   #25 (permalink)
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just sayin. something dosent sound right there, if the pick up wasn't set up to be adjustable to begin with, you shouldn't have to elongate the mount holes to make a adjustment,a pick up set at no adjustment means non adjustable pick up , are u for sure what the pick up is for? i see very clearly , it is operating proper, but have u ridden the sled? you may have a op problem some where else now,btw spinning the engine with a drill may not be the proper rpm, 150 sounds too high, try 5 good rips with the cord , good luck

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Old 04-20-2017, 01:56 AM   #26 (permalink)
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We had the recoil removed to inspect the pickups when the compression test was performed. I'm sure if we had tested comp with the cord, it would've been 140-145. Seeing as the motor was never opened up from the factory, we felt good that they were identical side-side. I tend to agree with you on elongating the holes in the pickup. My uncle performed that modification on his own. This stalling issue has been somewhat of an intermittent problem. It's possible that he got 30 lucky engine reversals. It was nothing for this sled to get 10 without a problem. But once it started acting up/dying , it usually stalled again and again. These pickups were changed previously while hunting down a wiring short. I suppose it's possible they were a mismatched set. Kinda why I'd like to see someone break out the feeler gauges next time a recoil is off. Thanks for the help everyone
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Old 04-20-2017, 08:46 AM   #27 (permalink)
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Glad to hear it was something relatively simple ... thanks for the update!
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Old 04-20-2017, 11:56 PM   #28 (permalink)
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Not a problem. Nothing more frustrating than looking for a solution to a problem and the op never chimes back in on what fixed it. i spoke with him today and tried the sled for myself. It is definitely fixed. He said the pickups had one hole sized exactly for the bolt, the other was enlarged to ensure fitment to the other threaded hole in the case. He slotted the hole maybe a 32nd of an inch and it put it the same distance from the flywheel as the other. Also said the pickups had different plugs on them, so they are the correct set. Hope this helps someone later on. Doesn't seem like a common issue, but it fixed his.
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Old 04-21-2017, 08:35 PM   #29 (permalink)
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Ehhhhnow.....kinda mimicked a "stator issue" didn't it. Glad you guys got it. Next time I have one open, I'm going to check that out.
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