Last month I replaced the Isky Z-196 cam with the A cam. Today I swapped the 4.88 out for the 3.70 pumpkin. Went on a test drive and was quite suprised on how well it ran. It's nice to be able to go on the highway and not spin the engine a 4K. I'm getting some pinging lightly in higher gears so I an going to retard the cam before I change the ignition curve.
Bye Bye 4.88, hello 3.70...........
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Mellowing the Roadster
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- spyder
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- rwmann
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Re: Mellowing the Roadster
Makes sense, though the 3.9 with 5-speed is a nice balance, too.
- spyder
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Re: Mellowing the Roadster
I really didn't notice that much performance difference with the 3.90 or the 4.10. I suspect it was because the cam didn't do much until 4K plus rpm. The 4.88 got there quick. Now what to do with the oil pan and diff......
- theunz
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Re: Mellowing the Roadster
I suggest you keep all the performance parts because soon your son will be looking for more power and quicker acceleration.
Mike M
Old enough to know better, too old to remember why!
1969 2000 solex mine since 1972, under resurrection. (Finally resurrected as of spring 2019!)
1969 Porsche 911s -worth more, but not as valuable! Gone!
2017 Lotus Evora 400 - Oh my!!
Old enough to know better, too old to remember why!
1969 2000 solex mine since 1972, under resurrection. (Finally resurrected as of spring 2019!)
1969 Porsche 911s -worth more, but not as valuable! Gone!
2017 Lotus Evora 400 - Oh my!!
- rwmann
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Re: Mellowing the Roadster
The U20 with B-cam lights up at ~3000, which works well with the 3.90 and 5-speed. Sounds like the Isky is a C+.
- spyder
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Re: Mellowing the Roadster
Nope! Don't want him to be going fast in a 54 year old car without any of the safety stuff that is on todays cars. I manages to snap an axle with all the go fast stuff on it. Good thing it was in the differential. I plan to sell off the stuff I pulled. I won't need it and I don't want it on "his" car.