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Re: Expensive modification Posted by Jon [Email]  (#11)  [Profile/Gallery]
(more from Jon) on Sat, 6 Oct 2007 13:53:48
In Reply to: Expensive modification, tz, Sat, 6 Oct 2007 10:01:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
tz,
If you have a look at the link you will see that I do all of the work to my cars, everything except paint. I keep five classic 900 turbos registered and insured at all times. I have over 20 classic 900 Saabs, most are for parts only. I built the equal length headers that I installed on two of my cars. I built additional headers that I sold to other Saab enthusiasts to try to offset my costs. But, I found that my time is more valuable spent working on my own cars than doing work for other people. I just don't have enough spare time maintaining 5 cars, the newest being a 1991. Cost effective? Who knows? I love working on my cars and I have no problem with the cost.
It was NOT "a hell of an expensive modification" because I do my own work. I built the headers because of a conversation with another enthusiast that wanted a header for his car. He decided to build his own header and I decided that I could build one myself, also. As far as performance, both of the cars that I have headers on have dynoed 220 horse power at the wheels. But they have MANY almost identical modifications. The headers do not add horse power. They only remove the potential bottleneck to higher horse power. By the way, I have not relocated the battery in either car.
I will try to explain the long stud flexing at both ends. Because the cylinder head is made of aluminum and the stock exhaust manifold is made of cast iron they expand and contract at different rates. The studs are secured into the head thru the holes in the exhaust manifold with "tube" spacers then washers and nuts. The hole in the manifold is a larger diameter than the stud. The different rates of expansion and contraction allow the head to "move" against the manifold. The studs will move with the head against the manifold. The larger hole size and the "tube" sleeves at both ends of the manifold allow the stud to flex from where the nut is in relationship to where it is secured to the head.
The photo below is the latest header that I built. Perhaps you recognize the car. It belongs to the other enthusiast that originally built his own header. It now has a header that I built for him.
Jon
jon1..
http://www.nysoc.com/gallery/album08
, Fri, 5 Oct 2007 15:20:11, Sat, 6 Oct 2007 13:53:48 <-- Viewing This Message
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