? About Compression Check - ZR-1 Net Registry Forums

We Gone · 12-10-2007

I changed my plugs this weekend and did compression check. 91 46K miles..by the way did it cold. as I was changing plugs..

200 205 215 205
200 210 205 225

? is about the 225???

12-10-2007

Test needs to be done with the engine warm... or at operating temps. Numbers are supposed to be in the 150-200 psi.

We Gone · 12-10-2007

what kind of differance will I see warm vs cold?

We Gone · 12-10-2007

Quote:

Originally Posted by Jeffvette

Test needs to be done with the engine warm... or at operating temps. Numbers are supposed to be in the 150-200 psi.

OK at Temp....195

228 230 226 230

225 228 225 230

12-10-2007

LOL, seems like the book numbers may be off. They are all within acceptable range of each other.

But high compression numbers can lead to detonation.

We Gone · 12-10-2007

Thanks that is what I have been having issues with detonation. went down 2 heat ranges on the plugs and it went away with the stock prom....Can't run the SGC prom with out getting 1 to 3 knoxs as I roll ito the throttle.

Zr1 Destroyer · 12-10-2007

If you really wanna put your motor to the test do a leak down on it!

bradslt5 · 12-10-2007

I agree . a leak down is really a tell all . summit has a good unit for just under a c note

We Gone · 12-10-2007

I'll check them out...thats the one tool I don't have...yet

These are from the snap-on scantool before plug change AC Rapid Fire #5 about 30K miles on them

Hot Chip
INT..L...129 R...128
BLM..L..128 R..136...only ran at temp for about 10min. no more than 30mph
MAP..1.12V Hg 9.2
TPS Closed...54
BPN L..3.8 R..4.0
O2..L..93 to 677 R..106 to 646
IAC..30
Spark Adv. 10-11 @ idle 900rpms the most adv I got was in the low 20s
Lots of ping & Knox

Stock chip
INT...L120-124....R120-124
BLM..L125....R131 about the same run time
MAP 1.24-1.26 hg 10
TPS closed.54
BPN.L4.0 R4.0
O2 L115-655 R155-668
IAC..20
Spark Adv. 8-10 @ idle 675rpms most Adv. 18-20
Some ping & Knox

After plug change NGK BKR7EIX

Hot Chip
INT..L...129 R...129
BLM..L..130 R..130... ran at temp for about 100 miles
MAP..1.12V Hg 9.2
TPS Closed...54
BPN L..4.0 R..4.0
O2..L..93 to 677 R..106 to 646
IAC..30
Spark Adv. 10-11 @ idle 900rpms the most adv I got was in the low 20s
1-3 knoxs & still some ping on throttle roll in

Stock chip
INT...L-128....R-128
BLM..L125....R125 about the same run time
MAP 1.24-1.26 hg 10
TPS closed.54
BPN.L4.0 R4.0
O2 L115-655 R155-668
IAC..20
Spark Adv. 8-10 @ idle 675rpms most Adv. 18-20
No knoxs on throttle roll in

I'll stick to the stock prom until I have time to get another tune.

bradslt5 · 12-10-2007

corey henderson has some cool tunes for a basicly stk motor (210)867-6286.

12-10-2007	#1
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,170	? About Compression Check I changed my plugs this weekend and did compression check. 91 46K miles..by the way did it cold. as I was changing plugs.. 200 205 215 205 200 210 205 225 ? is about the 225??? __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

12-10-2007	#2
Jeffvette Guest Posts: n/a	Re: ? About Compression Check Test needs to be done with the engine warm... or at operating temps. Numbers are supposed to be in the 150-200 psi.

12-10-2007	#3
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,170	Re: ? About Compression Check what kind of differance will I see warm vs cold? __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

12-10-2007	#6
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,170	Re: ? About Compression Check Thanks that is what I have been having issues with detonation. went down 2 heat ranges on the plugs and it went away with the stock prom....Can't run the SGC prom with out getting 1 to 3 knoxs as I roll ito the throttle. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

12-10-2007	#7
Zr1 Destroyer Join Date: Oct 2005 Location: Candy Apple...yUmMy Posts: 1,137	Re: ? About Compression Check If you really wanna put your motor to the test do a leak down on it!

12-10-2007	#5
Jeffvette Guest Posts: n/a	Re: ? About Compression Check LOL, seems like the book numbers may be off. They are all within acceptable range of each other. But high compression numbers can lead to detonation.

12-10-2007	#8
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: ? About Compression Check I agree . a leak down is really a tell all . summit has a good unit for just under a c note

12-10-2007	#9
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,170	Re: ? About Compression Check I'll check them out...thats the one tool I don't have...yet These are from the snap-on scantool before plug change AC Rapid Fire #5 about 30K miles on them Hot Chip INT..L...129 R...128 BLM..L..128 R..136...only ran at temp for about 10min. no more than 30mph MAP..1.12V Hg 9.2 TPS Closed...54 BPN L..3.8 R..4.0 O2..L..93 to 677 R..106 to 646 IAC..30 Spark Adv. 10-11 @ idle 900rpms the most adv I got was in the low 20s Lots of ping & Knox Stock chip INT...L120-124....R120-124 BLM..L125....R131 about the same run time MAP 1.24-1.26 hg 10 TPS closed.54 BPN.L4.0 R4.0 O2 L115-655 R155-668 IAC..20 Spark Adv. 8-10 @ idle 675rpms most Adv. 18-20 Some ping & Knox After plug change NGK BKR7EIX Hot Chip INT..L...129 R...129 BLM..L..130 R..130... ran at temp for about 100 miles MAP..1.12V Hg 9.2 TPS Closed...54 BPN L..4.0 R..4.0 O2..L..93 to 677 R..106 to 646 IAC..30 Spark Adv. 10-11 @ idle 900rpms the most adv I got was in the low 20s 1-3 knoxs & still some ping on throttle roll in Stock chip INT...L-128....R-128 BLM..L125....R125 about the same run time MAP 1.24-1.26 hg 10 TPS closed.54 BPN.L4.0 R4.0 O2 L115-655 R155-668 IAC..20 Spark Adv. 8-10 @ idle 675rpms most Adv. 18-20 No knoxs on throttle roll in I'll stick to the stock prom until I have time to get another tune. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold Last edited by We Gone; 12-10-2007 at 06:55 PM.

12-10-2007	#10
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: ? About Compression Check corey henderson has some cool tunes for a basicly stk motor (210)867-6286.