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william1764 |
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#1
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Member ![]() ![]() Group: Members Posts: 252 Joined: 11-May 10 From: maryland Member No.: 11,717 Region Association: MidAtlantic Region ![]() |
Just had completed a full engine rebuild of my stock 2.0L (with Webers) to a 2.3L by a small Porsche indy in Maryland (2.256 big bore, 10:2:1 compression, mild cam). Carbs were also rebuilt to accommodate new build. Unfortunately, engine runs like crap with incessant backfire out of exhaust and carbs (during both acceleration and deceleration). Hard to even really tell yet how the increase in displacement feels due to the bucking and backfiring. However, I do know that power seems to peak at mid 4K range. Planned to have dyno'd but until this is resolved no point. Their estimated build time of 2 months took 14 months and still not drivable so I'm a bit frustrated. Indy acknowledges that he doesn't know what the issue is. Said he suspects its carbs but not certain. Wants me to invest in a new set. To be clear, the carbs have worked perfectly for the last 10 years up to the day i dropped off to their shop. Indy acknowledges no issue with carbs when he received. Frankly, I've lost all confidence and contemplating having another shop look at this issue and resolve. In all fairness, this is not a hack shop...very reputable. I don't want to bash/mention names. Requesting recommendation of an indy, ideally in Maryland, that is capable of assessing and hopefully fixing the issue.
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william1764 |
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#2
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Member ![]() ![]() Group: Members Posts: 252 Joined: 11-May 10 From: maryland Member No.: 11,717 Region Association: MidAtlantic Region ![]() |
Great advice all, thank you.
I failed to mention that both times I went to pick up car the indy said he drove it earlier and it ran great. In both instances it ran horribly for me...exhaust backfire, carbs popping, bucking, etc. all the way home (25 minutes). I sent him video recording of my drive home last week that captured the constant backfiring...he said he experienced none of that. How is that possible? |
Shivers |
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#3
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,453 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California ![]() |
Great advice all, thank you. I failed to mention that both times I went to pick up car the indy said he drove it earlier and it ran great. In both instances it ran horribly for me...exhaust backfire, carbs popping, bucking, etc. all the way home (25 minutes). I sent him video recording of my drive home last week that captured the constant backfiring...he said he experienced none of that. How is that possible? Someone thought the Yugo was a good idea...Anything is possible if he didn't get it warm running it around the block. Weird stuff can happen when they warm up. Valve lash too tight, engine gets hot and valves are left open. Coil going bad, first it runs fine then it gets hot and car runs like crap. All sorts of stuff can happen. Don't beat your head against a wall, start at the beginning. Good luck. |
wonkipop |
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#4
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,420 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille ![]() ![]() |
Great advice all, thank you. I failed to mention that both times I went to pick up car the indy said he drove it earlier and it ran great. In both instances it ran horribly for me...exhaust backfire, carbs popping, bucking, etc. all the way home (25 minutes). I sent him video recording of my drive home last week that captured the constant backfiring...he said he experienced none of that. How is that possible? Someone thought the Yugo was a good idea...Anything is possible if he didn't get it warm running it around the block. Weird stuff can happen when they warm up. Valve lash too tight, engine gets hot and valves are left open. Coil going bad, first it runs fine then it gets hot and car runs like crap. All sorts of stuff can happen. Don't beat your head against a wall, start at the beginning. Good luck. it could be a bad coil on the way out. looking at your photo it looks new. some do come out of the box not good these days? it could also be any of the other things. to be fair to the engine builders sometimes these things can be confounding. they will run the car and it won't do it for them. but this does sound a bit like they should have got it good and hot and driven it for 20 minutes/half an hour. properly test driven it. if they get the faults up then its going to take a good mechanic with a good instinct for where to look. i would judge them by their reaction to the issue once they have made it happen. if necessary take one of them out in the car with you and drive it until it does it with the mechanic in the car. and then see what the reaction/comeback/opinion is. and make up your mind about them. stay cool and don't lose your confidence. |
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