Passion, It's the thing that drives us to achieve. The push we feel to dare to dream something, ideal, and then manifest that vision into reality. For anyone who's ever fallen head over heels into an engine bay, or body work, or getting your car track ready, YOU KNOW that feeling that drives you to customize and make things as you feel they should be. Your intuition is second to none. RC Car Skyline GTR R34 Custom Built Remote Control Car This GTR is no different from any of the other incredible cars featured on this site ( just look around; there's red ones , blue ones , silver ones , white ones , black ones ) - except for one, small, detail. - It's 1/7th the size! You wouldn't be able to fit inside it, but it still rips around like a GTR should, and is a whole lot of fun to drive I'm sure, and the customization on this build is phenomenal. Nissan Skyline GTR RC Car Rear End Spotted on the RC sub, user XJuggernaut101 shared their build story with us of ho
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While I would like to tell you that right off the bat I would suspect piston rings based on the fact you said on cold start it's low pressure but on gas it's solid - I think making this assumption could be dangerous and not worth saying, because, whatever the problem is it needs to be addressed. I would first bring it to a second mechanic, don't tell them anything and just have them do a second compression test - compare the results. Maybe they will get good results? Second, assuming Mechanic #2 gets the same reading, I would think to myself "whatever is causing the low reading has happened for a reason" meaning, if it's a valve that's not sealing correctly, why did the valve seal change? has some debris run through the engine perhaps? This is where an engine leak-down test can tell you whether your issue lies in the head or in the block. Personally I would agree with your mechanic's presumption that it's not going to be bearings, you would be able to hear that symptom. Could be piston rings though, could be a gouged bore, as you rev and more oil flows it would make sense that the oil could block the gap/gouge and you get full power again. Lastly, I contend that you likely cannot physically tell the difference between 6 cylinders pulling @ 160 PSI under boost, VS 5 cylinders and one crippled under boost... simply put, under boost I don't believe anyone could tell just by "feel"... get a second opinion, leak-down test to confirm diagnosis. Good luck.
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