SR20det Redtop no compression in 3 cylinders - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

hdhype · 10-25-2012, 04:53 AM

I recently put in a redtop into my s13. I got it started and running this past weekend for the first time. I was having an issue were once I hit positive boost pressure (around 2000 RPM) my engine would lose power much like if I had taken my foot off the gas pedal.

Today I go to crank up my engine so I could troubleshoot some more. It started rough, going back and forth between 800 - 1500 RPM. Then it just stops. I tried cranking it to no avail. I decided to check compression, and only cylinder 2 was able to show anything at all (8 Bar). Cylinders 1,3,4 don't show a thing.

When I look down the spark plug holes I can see each cylinder move when cranked. Another thing I remember noticing is that when it cranked up, every once-in-a-while I would hear something that kinda sounds like grinding for 1/6th of a second then go away.

Edit*
Another thing I want to add is that it was idling just fine yesterday. Also My oil light kept flickering on and off even though I have plenty of oil in it.

Sileighty_85 · 10-25-2012, 05:03 AM

Wiring/ MAFS issues for the running/driving issues
or Fouled out plugs

Compression: bad gauge/ incorrect testing procedure

Get an Oil pressure tester to make sure your oil pump is not failing

hdhype · 10-25-2012, 05:18 AM

First I want to say thanks for the quick reply Sileighty_85, looking at your build threads have been an inspiration.

For the compression test we used 2 gauges (and 2 different people testing) just to make sure it was reading correctly. I even felt air coming out of cyl 2 when I put my hand above it. But I felt nothing coming from the others.

Will do with the oil Pressure tester.

*fliprayzin240sx* · 10-25-2012, 08:31 AM

Take the valve cover off, look in the FSM and double check to make sure your mechanical timing is good. It sounds like its off, hard to show 3 dead 0 compression cylinders on one sitting. I'm willing to bet that its off and the valves arent closing properly

hdhype · 10-25-2012, 11:19 AM

I checked under the valve cover, and I have good news and bad news.

Good news is that it was easily identifiable that the timing was off...

The bad news is that it was easily identifiable that the timing.. was off

Now I would imagine that since these are interference engines....

I appreciate Sleighty_85 and fliprayzin240sx for helping me out.

I'm going to go re-evaluate my life.

future · 10-25-2012, 11:26 AM

Damn. Well at least you didn't have to go to into depth. Good luck on the rebuild

Davidna2fi · 10-30-2012, 11:30 AM

$10 says you used an impact on that bolt....

Did you use an impact to put the camshaft bolt on? If so that's probably why it broke like it did since it had cracks already in it and just over time the tension cracked it even more until it broke off.

10-25-2012, 04:53 AM	#1
hdhype Join Date: Nov 2011 Location: Georgia Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	SR20det Redtop no compression in 3 cylinders I recently put in a redtop into my s13. I got it started and running this past weekend for the first time. I was having an issue were once I hit positive boost pressure (around 2000 RPM) my engine would lose power much like if I had taken my foot off the gas pedal. Today I go to crank up my engine so I could troubleshoot some more. It started rough, going back and forth between 800 - 1500 RPM. Then it just stops. I tried cranking it to no avail. I decided to check compression, and only cylinder 2 was able to show anything at all (8 Bar). Cylinders 1,3,4 don't show a thing. When I look down the spark plug holes I can see each cylinder move when cranked. Another thing I remember noticing is that when it cranked up, every once-in-a-while I would hear something that kinda sounds like grinding for 1/6th of a second then go away. Edit* Another thing I want to add is that it was idling just fine yesterday. Also My oil light kept flickering on and off even though I have plenty of oil in it. Last edited by hdhype; 10-25-2012 at 04:58 AM.. Reason: Adding some other information

10-25-2012, 05:03 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Wiring/ MAFS issues for the running/driving issues or Fouled out plugs Compression: bad gauge/ incorrect testing procedure Get an Oil pressure tester to make sure your oil pump is not failing __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

10-25-2012, 08:31 AM	#4
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Take the valve cover off, look in the FSM and double check to make sure your mechanical timing is good. It sounds like its off, hard to show 3 dead 0 compression cylinders on one sitting. I'm willing to bet that its off and the valves arent closing properly __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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10-25-2012, 05:18 AM	#3
hdhype Join Date: Nov 2011 Location: Georgia Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	First I want to say thanks for the quick reply Sileighty_85, looking at your build threads have been an inspiration. For the compression test we used 2 gauges (and 2 different people testing) just to make sure it was reading correctly. I even felt air coming out of cyl 2 when I put my hand above it. But I felt nothing coming from the others. Will do with the oil Pressure tester.

10-25-2012, 11:19 AM	#5
hdhype Join Date: Nov 2011 Location: Georgia Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	I checked under the valve cover, and I have good news and bad news. Good news is that it was easily identifiable that the timing was off... The bad news is that it was easily identifiable that the timing.. was off Now I would imagine that since these are interference engines.... I appreciate Sleighty_85 and fliprayzin240sx for helping me out. I'm going to go re-evaluate my life.

10-30-2012, 11:30 AM	#7
Davidna2fi Zilvia Junkie Join Date: May 2008 Location: Houston, TX Posts: 513 Trader Rating: (18) Feedback Score: 18 reviews	$10 says you used an impact on that bolt.... Did you use an impact to put the camshaft bolt on? If so that's probably why it broke like it did since it had cracks already in it and just over time the tension cracked it even more until it broke off.