Compression readings on 12A engine

Rotary Engine Chat......Got A Problem With Your Rotary Engine.... Need Help...?
rei99
Posts: 91
Joined: Sun Oct 02, 2011 12:01 pm
Location: Asti, Italy
Contact:

Re: Compression readings on 12A engine

Post by rei99 » Fri Oct 05, 2012 11:37 am

Monday I take the Elford for test. In the afternoon, if all going ok, the clear blue with original 12A and update here g-l

rei99
Posts: 91
Joined: Sun Oct 02, 2011 12:01 pm
Location: Asti, Italy
Contact:

Re: Compression readings on 12A engine

Post by rei99 » Mon Oct 08, 2012 1:35 pm

Mazda dealer done this morning: 8.1 and 8.0 at the starter motor rpm (about 200).
They tell me so, but it looks very strange to me :roll: : for a 12A (with rebuild titanium tips) seems too high, now I've found one, I try to do myself until the car came back home (is there for the carb).

User avatar
chc
Posts: 773
Joined: Thu Mar 31, 2011 9:22 pm
Location: Wirral

Re: Compression readings on 12A engine

Post by chc » Tue Jan 01, 2013 8:50 pm

I had JAZ tested in November 2012 with following results
Front - 6.6 - 7.0
Rear - 7.1 - 7.6
Had this done by Motorsport B (Queensferry) and very pleased with the findings h[b[
Cliff

1983 Series 2 - Stardust Blue Elford Turbo

User avatar
ian65
Posts: 5653
Joined: Wed Mar 30, 2011 12:11 am

Re: Compression readings on 12A engine

Post by ian65 » Tue Jan 01, 2013 8:54 pm

those are healthy results Cliff...... no engine teardown looming for you.
1986 Series 3 13B Turbo II
http://rx7fb.com/viewtopic.php?f=2&t=2400
1992 Peugeot 205 1.9 GTI
1975 Honda SL125 Street Scrambler

rei99
Posts: 91
Joined: Sun Oct 02, 2011 12:01 pm
Location: Asti, Italy
Contact:

Re: Compression readings on 12A engine

Post by rei99 » Sat May 11, 2013 8:03 pm

Finally done! I've the video, by now just the value 8-)

- Clear blue Mk. II, 72.000km about, 12A
Front: 7,1 / 6,8 / 6,9 kg/cm2 @ 250rpm.
Rear: 7,2 / 6,6, / 6,9 kg/cm2 @ 252rpm.

- Elford Turbo Mk. II, 71.141km (rebuild done declared from past seller), 12A Elford Turbo
Front: 6,9 / 7,2 / 7,2 kg/cm2 @ 247rpm.
Rear: 6,6 / 6,7 / 6,8 kg/cm2 @ 240rpm. II try: 6,9 / 7,1 / 7,1 kg/cm2 @ 254rpm.

- Black SA22C with 13B 4ports, 25.000 km
Front: 9,2 / 9,4 / 9,3 kg/cm2 @ 248rpm. II try: 9,3 / 9,2 / 9,5 kg/cm2 @ 239rpm.
Rear: 9,6 / 10,0 / 10,0 kg/cm2 @ 239rpm. (morning) II try: 8,9 / 9,4 / 9,2 kg/cm2 @ 241rpm. (afternoon)

With original Mazda tester.
Happy, all ok, incredible the value of the Black one :shock:

Chud
Posts: 889
Joined: Fri Apr 01, 2011 7:35 am
Location: North Dorset, UK

Re: Compression readings on 12A engine

Post by Chud » Sat May 11, 2013 8:43 pm

You gotta be happy with that!
instagram: tymboooo

1980 series 1 RX7
1983 series 2 RX7
1975 RX3 Coupe
1959 VW Splitscreen Kombi "The Queen"
1971 VW Adventurewagen
1966 Porsche 912


User avatar
ian65
Posts: 5653
Joined: Wed Mar 30, 2011 12:11 am

Re: Compression readings on 12A engine

Post by ian65 » Thu Oct 25, 2018 10:59 pm

holy thread resurrection Batman! Just revisiting this thread from 2011 after discussing Petes awesome comp tester on the FB page and saw the test results for Keiths engine from 7 and 1/2 years ago.... I wonder what that engines putting out now that I've been running a turbo on it for the last couple of years?
1986 Series 3 13B Turbo II
http://rx7fb.com/viewtopic.php?f=2&t=2400
1992 Peugeot 205 1.9 GTI
1975 Honda SL125 Street Scrambler

User avatar
myatt1972
Posts: 1442
Joined: Thu Mar 31, 2011 10:54 am
Location: Staffordshire Moorlands

Re: Compression readings on 12A engine

Post by myatt1972 » Mon Oct 29, 2018 11:18 pm

Bloody hell was it that long ago :o :o :o
Keith...

Post Reply