Engine modifications, What makes the best sense ? |
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Engine modifications, What makes the best sense ? |
jim_hoyland |
Jul 2 2016, 07:42 PM
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#1
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Get that VIN ? Group: Members Posts: 9,418 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
About 10 years ago my stock '75 1.8L L-Jet was rebuilt. A 2L crank was installed along with 94mm pistons.
Can runs good, slows down quite a bit on hills. My mechanic has suggested replacing the cylinders/Pistons with 96mm. The engine would be kept FI with the L-Jet Does this make sense and would other mods be required ? |
Mark Henry |
Jul 2 2016, 08:43 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
96mm over 94mm won't make a difference, at least not noticeable.
I wouldn't change unless you need new P&Cs. L-jet is what it is, smooth running, predictable, but it's not a powerhouse. The only cheap mod that will make good, noticeable improvement is a set of headers...but then you will lose heat. |
ClayPerrine |
Jul 2 2016, 08:57 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
L-jet is what it is, smooth running, predictable, but it's not a powerhouse. I disagree. The L-Jet on Betty's 914 is great. It is smooth and reliable. And it is the basis for the Motronic system used on all current Porsche cars. The biggest problem with a stock motor is breathing. Bigger valves, a different cam, and a bigger throttle body does wonders for a 914 with L-Jet. I put a Raby 9590 cam in Betty's car, along with 2.0 valves in 1.8 heads and a Bus throttle body. Doing that woke up the motor. It pulls strong all the way to redline. |
Mark Henry |
Jul 2 2016, 09:53 PM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
L-jet is what it is, smooth running, predictable, but it's not a powerhouse. I disagree. The L-Jet on Betty's 914 is great. It is smooth and reliable. And it is the basis for the Motronic system used on all current Porsche cars. The biggest problem with a stock motor is breathing. Bigger valves, a different cam, and a bigger throttle body does wonders for a 914 with L-Jet. I put a Raby 9590 cam in Betty's car, along with 2.0 valves in 1.8 heads and a Bus throttle body. Doing that woke up the motor. It pulls strong all the way to redline. I don't mean that in a bad way, I have a 914 2.0 with L-jet here and it's every bit as powerful as a D-jet. In fact it's a hoot, may be the kick in the pants I needed to get my 3.0 914 finished. I'm also biased as I've never driven a stock engined aircooled anything, at least not for very long. I guess driving a 180hp 2.6L T4 in a 1700lb VW bug has me a tad spoiled. (IMG:style_emoticons/default/biggrin.gif) Are the 2.0 valves direct replacements, or does other work need to e done on the head.? You would have to replace the seats. I'd get real 2.0 heads and do a straight swap. Still not anywhere near the gain of a set of headers. |
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