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Thread: Craigs red repu....
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repumax
Redlining
Posts: 427
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posted January 28, 2005 06:18 PM |
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Craigs red repu....
....has a little bit of a cough. This is my 6th rotary I've owned and the only original one as well. All the others had an after market carb and a header so they were pretty easy to tune. Here is the problem. The truck pops out some small back firing in between shifts thru out all rpm's. I don't even know where to start. Any suggestions?
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Tom93R1
Redlining
Posts: 458
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posted January 31, 2005 06:14 AM |
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Small exhaust leak maybe? At least worth checking out the areas around the manifold .
____________
'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!
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ovquick
Redlining
Posts: 253
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posted January 31, 2005 10:57 AM |
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cough
Check to see the throttle plates close at idle and check the de-cel valve. Racing Beats early catalog touched on this if you have one available.
____________
Manteca Mazda Asylum
where a boy and his cat live, without adult supervision
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kansei
Redlining
Wankelized
Posts: 423
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posted January 31, 2005 02:48 PM |
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Aside from all the obvious issues...
A bit more of a reach, but I had the same issue with an '83 RX-7 here (a customer's car), completely bone stock, and it turned out to be slightly obstructed air bleeds in the carb. Floats being out of wack from one another can also cause it, due to a slightly rich situation.
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Neal A.E. Swigert
Greenville, Michigan
1974 REPU Resto Project
1976 808 Wagon
1977 Cosmo
1978 Savanna RX-7 GT
1980 Leather Sport RX-7
1980 Petty Targa RX-7 #11
1985 GSL-SE RX-7
1988 RX-7 10th Ann
1993 RX-7 VR Touring
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repumax
Redlining
Posts: 427
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posted January 31, 2005 05:34 PM |
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Thanks.....
....for the help guys. I definitely have a starting point now.The big bummer is I can't work on it for a while. I fell off my roof on dec. 18th and broke my right foot and arm. As soon as I get it fixed I'll post what the problem was.
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kansei
Redlining
Wankelized
Posts: 423
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posted January 31, 2005 05:39 PM |
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Max- I never did find out where you live. Where exactly did Craig's truck wind up?
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Neal A.E. Swigert
Greenville, Michigan
1974 REPU Resto Project
1976 808 Wagon
1977 Cosmo
1978 Savanna RX-7 GT
1980 Leather Sport RX-7
1980 Petty Targa RX-7 #11
1985 GSL-SE RX-7
1988 RX-7 10th Ann
1993 RX-7 VR Touring
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repumax
Redlining
Posts: 427
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posted January 31, 2005 05:44 PM |
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San Diego, CA. Actually Escondido, north sd county.
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1974 Mazda Repu
1986 Yamaha RZ 500
1988 Yamaha YSR 50
1991 Suzuki RGV 250
1992 Yamaha TZR 250 SP
1996 Aprilia RS 250
2003 Ford F-450 6.0 Diesel
2004 Mazda RX8
2006 Yamaha Banshee
2014 18' Eclipse Toy Hauler
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kansei
Redlining
Wankelized
Posts: 423
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posted January 31, 2005 05:50 PM |
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Really.... I'm coming out to San Diego the week of the 13th this month. Any chance I may be able to see the truck in person?
Neal.
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Neal A.E. Swigert
Greenville, Michigan
1974 REPU Resto Project
1976 808 Wagon
1977 Cosmo
1978 Savanna RX-7 GT
1980 Leather Sport RX-7
1980 Petty Targa RX-7 #11
1985 GSL-SE RX-7
1988 RX-7 10th Ann
1993 RX-7 VR Touring
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repumax
Redlining
Posts: 427
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posted January 31, 2005 05:56 PM |
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Sounds great, drop me an E-mail and I'll send you my phone #.
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1974 Mazda Repu
1986 Yamaha RZ 500
1988 Yamaha YSR 50
1991 Suzuki RGV 250
1992 Yamaha TZR 250 SP
1996 Aprilia RS 250
2003 Ford F-450 6.0 Diesel
2004 Mazda RX8
2006 Yamaha Banshee
2014 18' Eclipse Toy Hauler
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klaus42
Rotorhead
Posts: 1877
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posted February 03, 2005 09:56 AM |
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Hey Neal!
Gonna swing by the North part of our west coast while you're 'here' ? (Just checking!)
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repumax
Redlining
Posts: 427
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posted May 07, 2005 10:26 AM |
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No more cast's or crutches....
......I'm finally healing up and getting around better. Did a few things to my 75 which I'm going to sell here soon and started working on the 74. I went thruogh the emissions section of the manual and checked everything one by one. Turns out I had a few vacuum leaks,a bad ventilation valve and a bad altitude compensater. Results, she runs alot better but still backfires a little. If I baby it, it pops between shifts.If I run her hard (preferred)it only pops occasionally. Also, the small vacuum line that comes off the air cleaner to the air control valve. I took it of and plugged it at the a.c. valve, revd it up and no popping. I'm going to drive it like that today and see what happens.
Thanks again to Wvoight for the parts!
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klaus42
Rotorhead
Posts: 1877
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posted May 10, 2005 08:18 AM |
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Good to hear you're healing up, Max!
Sounds like you're finding out precisely how and why rotaries got 'known' for backfiring in stock trim, back in 'the day'...
Why not keep your '75, and make it the modified, bridgeported one?
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