Header installation issues
09-26-14, 04:06 PM
#1
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Header installation issues
Just installed a header on my 1979 RX7 stock12A & have pulled off all the existing exhaust system & want to replace it with a modified system ( smaller cat converter & smaller rear muffler.) Not put a header on a vehicle before so I'm not familiar with impact it makes to previous engine operation. In the RX7's case it started & ran very well before I yanked all the stock stuff off - now it starts extremely hard & runs poorly. Afraid to even drive it around the block!! HELP!!!
09-26-14, 11:25 PM
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manifold leak
that was one of my thoughts that there is a vacuum issue. Another is with the heat exchanger gone the pipe to the air pump is an issue, I did block it off, but maybe not well enough!?
12-08-14, 06:51 PM
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Hard starting with new header installation
Well I finally did get my '79 12A going after I installed the header! Several attempts with drying out the plugs & making sure the battery was sufficiently charged were necessary. Starting it the same way as before, always with the fear that it will be flooding - it takes several tries & on the last one that just seems to be the flooding point it will out it will mysteriously fire up & then starts running. A little disconcerting, but has reliably started up ever since.
12-09-14, 03:55 AM
#7
Seem to recall the Nikki's are set to run richer WITH the factory reactor (79, 80), so maybe too much now with the Header install.
Is the emission stuff still in place. removing the Rat's Nest requires some thoughtful routing/blocking or various fittings on the intake mani. Archives here should detail this.
AND-
generally to get all the extra HP out of a header, Racing Beat suggests you need a free-flow muffler (like *cough* theirs) to get any juice.
Stu Aull
80GS
Alaska
Is the emission stuff still in place. removing the Rat's Nest requires some thoughtful routing/blocking or various fittings on the intake mani. Archives here should detail this.
AND-
generally to get all the extra HP out of a header, Racing Beat suggests you need a free-flow muffler (like *cough* theirs) to get any juice.
Stu Aull
80GS
Alaska
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12-09-14, 01:26 PM
#9
Seem to recall the Nikki's are set to run richer WITH the factory reactor (79, 80), so maybe too much now with the Header install.
Is the emission stuff still in place. removing the Rat's Nest requires some thoughtful routing/blocking or various fittings on the intake mani. Archives here should detail this.
AND-
generally to get all the extra HP out of a header, Racing Beat suggests you need a free-flow muffler (like *cough* theirs) to get any juice.
Stu Aull
80GS
Alaska
Is the emission stuff still in place. removing the Rat's Nest requires some thoughtful routing/blocking or various fittings on the intake mani. Archives here should detail this.
AND-
generally to get all the extra HP out of a header, Racing Beat suggests you need a free-flow muffler (like *cough* theirs) to get any juice.
Stu Aull
80GS
Alaska
I'd say to go with a MagnaFlow muffler since they are extremely free flowing, although they are a touch on the noisy side. Of course an entire RB exhaust setup would be the best way to go, but you have to have the money to invest in it.
12-09-14, 03:35 PM
#10
Just rip the whole emissions rack out, block all the ports at the carb base and, run a split vacuum line from the 2nd carb port to the distributor vacuum pots, run a fuel line from the upper oil filler neck port to a port on the carb air filter, and then put a tiny breather on the port on the base of the oil filler neck. Done. Takes 20 minutes. Start it up, adjust fuel mixture and timing.
12-09-14, 05:15 PM
#11
Just rip the whole emissions rack out, block all the ports at the carb base and, run a split vacuum line from the 2nd carb port to the distributor vacuum pots, run a fuel line from the upper oil filler neck port to a port on the carb air filter, and then put a tiny breather on the port on the base of the oil filler neck. Done. Takes 20 minutes. Start it up, adjust fuel mixture and timing.
12-09-14, 07:27 PM
#13
Perhaps, most advise to run a dual alternator pulley so that the WP is still driven by two belts.
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
12-10-14, 12:02 AM
#14
Perhaps, most advise to run a dual alternator pulley so that the WP is still driven by two belts.
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
12-10-14, 12:16 AM
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Racing Beat air cleaner air filter
Perhaps, most advise to run a dual alternator pulley so that the WP is still driven by two belts.
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
Search for this, it will have the part # of the pulley you need and the two identical belts to run.
Also make sure to block off the hole left behind in your air cleaner. The air pump taps into the filtered portion...
12-11-14, 03:52 AM
#16
Yoohoo Belt
is made for the job.
Stu Aull
80GS
Alaska
12-14-14, 08:57 PM
#17
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No more air pump!
You need a different (non OE) water pump belt is all. THIS one
Yoohoo Belt
is made for the job.
Stu Aull
80GS
Alaska
Yoohoo Belt
is made for the job.
Stu Aull
80GS
Alaska
Thanks for the link. I'd seen this referenced before & kinda lost track of it. Just ordered one yesterday!
12-17-14, 08:14 PM
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Just got the Pineapple belt today - was expecting it to be a little bit wider?! Will give it whirl when I get that air pump off. May try to sell this one now as is - see how the '81 sale goes.
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