3.2 Twin-plug
11-16-2001, 12:19 PM
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3.2 Twin-plug
In another thread Steve Weinert states that the 3.2 engines are relatively easy to convert to twin-plug. Since my motor will in the near future require rebuild I've considered this alternative. I understand that twin-plug allows higer compression due to the shorther flame path(s). Specifically, my questions are:
1. What is a reasonable compression ratio for a street/auto-X, DE;
2. What are the approximate costs (parts, labor, machine work).
Any info from any member who has done this will be appreciated. Also, whay sort of power did anyone get at the flywheel after conversion.
Thanks
Paul
1. What is a reasonable compression ratio for a street/auto-X, DE;
2. What are the approximate costs (parts, labor, machine work).
Any info from any member who has done this will be appreciated. Also, whay sort of power did anyone get at the flywheel after conversion.
Thanks
Paul
11-16-2001, 01:13 PM
#2
RL Technical Advisor
Originally posted by BlueMax:
<STRONG>In another thread Steve Weinert states that the 3.2 engines are relatively easy to convert to twin-plug. Since my motor will in the near future require rebuild I've considered this alternative. I understand that twin-plug allows higer compression due to the shorther flame path(s). Specifically, my questions are:
1. What is a reasonable compression ratio for a street/auto-X, DE;
2. What are the approximate costs (parts, labor, machine work).
Any info from any member who has done this will be appreciated. Also, whay sort of power did anyone get at the flywheel after conversion.
Thanks
Paul</STRONG>
<STRONG>In another thread Steve Weinert states that the 3.2 engines are relatively easy to convert to twin-plug. Since my motor will in the near future require rebuild I've considered this alternative. I understand that twin-plug allows higer compression due to the shorther flame path(s). Specifically, my questions are:
1. What is a reasonable compression ratio for a street/auto-X, DE;
2. What are the approximate costs (parts, labor, machine work).
Any info from any member who has done this will be appreciated. Also, whay sort of power did anyone get at the flywheel after conversion.
Thanks
Paul</STRONG>
May I address a few of your questions,......
1) With twin-ignition, you may use up to 10.5:1 on pump premium.
2) You will need to have your heads and lower valve covers machined ($ 375), a good used 964 distributor, ($450), the Andial Motronic splitter unit ($ 595), a plug wire harness and a good used Motronic coil. You should also install a set of lower plug hold-down clips.
Figure a 6-10% more power, depending upon final compression ratio, but an amazing increase in smoothness, throttle response and overall drivability. Those things do not measure well in inertial dyno tests.
11-16-2001, 07:00 PM
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Steve,
Thanks for the quick reply. I'm home from the office today to pursue some Porsche matters :-) I agree about driveability issues that a dyno does not show. My plans for the car are some moderate power enhancements with corresponding weight reduction. The car has to remain streetable.
How availabe are the twin-plug conversion parts (distributor and splitter)? What/how is/does the splitter function
Perhaps in the future I'll buy a tub for a true race car (wish).
Paul
Thanks for the quick reply. I'm home from the office today to pursue some Porsche matters :-) I agree about driveability issues that a dyno does not show. My plans for the car are some moderate power enhancements with corresponding weight reduction. The car has to remain streetable.
How availabe are the twin-plug conversion parts (distributor and splitter)? What/how is/does the splitter function
Perhaps in the future I'll buy a tub for a true race car (wish).
Paul
11-17-2001, 03:16 PM
#5
RL Technical Advisor
Originally posted by BlueMax:
<STRONG>Steve,
Thanks for the quick reply. I'm home from the office today to pursue some Porsche matters :-) I agree about driveability issues that a dyno does not show. My plans for the car are some moderate power enhancements with corresponding weight reduction. The car has to remain streetable.
How availabe are the twin-plug conversion parts (distributor and splitter)? What/how is/does the splitter function
Perhaps in the future I'll buy a tub for a true race car (wish).
Paul</STRONG>
<STRONG>Steve,
Thanks for the quick reply. I'm home from the office today to pursue some Porsche matters :-) I agree about driveability issues that a dyno does not show. My plans for the car are some moderate power enhancements with corresponding weight reduction. The car has to remain streetable.
How availabe are the twin-plug conversion parts (distributor and splitter)? What/how is/does the splitter function
Perhaps in the future I'll buy a tub for a true race car (wish).
Paul</STRONG>
The componentry is readily available, no problem. One can find good used 964 distributors and we rebuild them here with new belts, etc, all the time.
The Motronic splitter unit divides the trigger signal from the distributor and provides the power to the second coil that fires the lower plugs.
