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44 posts
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by Litle brother » Mon Feb 11, 2013 11:42 am
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Last edited by Litle brother on Thu May 23, 2019 2:05 pm, edited 1 time in total.
- Litle brother
- Posts: 67
- Joined: Mon Feb 11, 2013 10:45 am
Re: Tuning my 3.0 SC, 204hp ROW engine
by Steve » Mon Feb 11, 2013 1:16 pm
Hi Eskild,
Welcome to the new Rennsport Forums,....its great to have your participation here! We'll try to offer useful & constructive assistance when and where we can.
I like your performance-enhancement "recipe", however I'd offer that 10.5:1 is too high for pump gas with single ignition. Even in you climate and 98RON fuels, I'd keep this under 10:1 so you have room for decent ignition timing. This is why Porsche never went over 9.8:1 on single-ignition street cars,...
If you really want 10.5:1, you will need to machine your heads for the lower plugs and install a twin-plug distributor.
We do indeed have JE make pistons to our specification since their regular 911 pistons have too much top ring land clearance. This allows the pistons to rock around the pin axis more at TDC, thus increasing ring and piston wear. Makes more noise and smoke, too. You can e-mail me directly to discuss and order.
Power-wise, a properly built engine like this has MUCH better throttle response (due to PMO's) and should make around 225-230 BHP with a 27-30 Nm bump in torque.
Welcome to the new Rennsport Forums,....its great to have your participation here! We'll try to offer useful & constructive assistance when and where we can.
I like your performance-enhancement "recipe", however I'd offer that 10.5:1 is too high for pump gas with single ignition. Even in you climate and 98RON fuels, I'd keep this under 10:1 so you have room for decent ignition timing. This is why Porsche never went over 9.8:1 on single-ignition street cars,...
If you really want 10.5:1, you will need to machine your heads for the lower plugs and install a twin-plug distributor.
We do indeed have JE make pistons to our specification since their regular 911 pistons have too much top ring land clearance. This allows the pistons to rock around the pin axis more at TDC, thus increasing ring and piston wear. Makes more noise and smoke, too. You can e-mail me directly to discuss and order.
Power-wise, a properly built engine like this has MUCH better throttle response (due to PMO's) and should make around 225-230 BHP with a 27-30 Nm bump in torque.
- Steve
- Site Admin
- Posts: 418
- Joined: Sun Jan 27, 2013 12:16 am
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by Litle brother » Tue Feb 12, 2013 4:23 am
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Last edited by Litle brother on Thu May 23, 2019 2:06 pm, edited 1 time in total.
- Litle brother
- Posts: 67
- Joined: Mon Feb 11, 2013 10:45 am
Re: Tuning my 3.0 SC, 204hp ROW engine
by Steve » Tue Feb 12, 2013 9:51 am
Hi Eskild,
As you might have guessed by now, your 32mm ports are small for a 3.0 litre engine that will see 6500 RPM. Ideally, you would use the early, big-port versions OR have your heads CNC'ed to big-port size and flow rates (which is something we do here).
That's the biggest obstacle from getting the power your are expecting,...
Single-ignition is just fine, however one needs to be conservative about CR to be able to use an advance curve that gives good throttle response and acceleration.
Be well,
As you might have guessed by now, your 32mm ports are small for a 3.0 litre engine that will see 6500 RPM. Ideally, you would use the early, big-port versions OR have your heads CNC'ed to big-port size and flow rates (which is something we do here).
That's the biggest obstacle from getting the power your are expecting,...
Single-ignition is just fine, however one needs to be conservative about CR to be able to use an advance curve that gives good throttle response and acceleration.
Be well,
- Steve
- Site Admin
- Posts: 418
- Joined: Sun Jan 27, 2013 12:16 am
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by Litle brother » Wed Feb 13, 2013 2:03 pm
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Last edited by Litle brother on Thu May 23, 2019 2:07 pm, edited 2 times in total.
- Litle brother
- Posts: 67
- Joined: Mon Feb 11, 2013 10:45 am
- Steve
- Site Admin
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by Litle brother » Thu Feb 14, 2013 4:06 am
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Last edited by Litle brother on Thu May 23, 2019 2:07 pm, edited 1 time in total.
- Litle brother
- Posts: 67
- Joined: Mon Feb 11, 2013 10:45 am
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by Litle brother » Thu Feb 14, 2013 6:47 am
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Last edited by Litle brother on Thu May 23, 2019 2:08 pm, edited 1 time in total.
- Litle brother
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Re: Tuning my 3.0 SC, 204hp ROW engine
by Steve » Thu Feb 14, 2013 8:17 am
- Steve
- Site Admin
- Posts: 418
- Joined: Sun Jan 27, 2013 12:16 am
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by Litle brother » Mon Mar 04, 2013 8:17 am
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Last edited by Litle brother on Thu May 23, 2019 2:09 pm, edited 2 times in total.
- Litle brother
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