 Anybody Built a 10.5:1 Type 1 or 4 Engine?, Do they explode? |
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| Series9 |
 Feb 9 2013, 10:15 PM
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#1
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Lesbians taste like chicken.  Group: Members Posts: 5,446 Joined: 22-August 04 From: DeLand, FL Member No.: 2,602 Region Association: South East States  |
I build 10.5:1 /6 engines pretty regularly. 93 octane and single plug. That's about the limit without going twin-plug, but all of them on the road have been fine.
Why don't I see this in Type 1 or Type 4 engines? Some rough math suggests a 2.0 @ 8.5:1 is an 85hp engine, while the same engine at 10.5:1 would give almost 120hp. Just thinking out loud..... (IMG:style_emoticons/default/beerchug.gif) |
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| rick 918-S |
Feb 10 2013, 12:31 AM
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#2
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Hey nice rack! -Celette Group: Members Posts: 21,114 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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No short answer Joe. Here's my short answer. 10:1 is totally do-able on pump gas. I built 11:1 BB Chevs and ran on pump gas. Several of my 6 cylinder BMW engines were 10:1 and higher. One of my BMW 2002 engines was 14:1
Alot has to do with increasing the amount of air/fuel you can get into the cylinders, the ability to light it up and the amount of air/exhaust you can remove. Then as you know it comes down to cooling. The bigger the explosion the more heat. Fuel can help cool the cylinders as well as oil and air with an air cooled engine. But I'm not telling you anything you don't already know. I think you were just thinking out loud. (IMG:style_emoticons/default/idea.gif) |
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Posts in this topic
Series9 Anybody Built a 10.5:1 Type 1 or 4 Engine? Feb 9 2013, 10:15 PM
Valy It's all about the cam you use. Longer duratio... Feb 9 2013, 10:36 PM euro911 Case design/strength? :confused:
Running a 9:1 C... Feb 9 2013, 10:37 PM larryM where ya planning to buy gas for it?
i paid ... Feb 9 2013, 10:41 PM messix i think it's more a question of what heads you... Feb 10 2013, 12:29 AM Dave_Darling The 911 has a better combustion chamber and better... Feb 10 2013, 12:37 AM a914622 If you real want the 12-1 comp. motor to run you n... Feb 10 2013, 01:05 AM
Series9
I had a 12-1 type1 1300 that broke 2 trannys on... Feb 10 2013, 08:44 AM Dasnowman What about doing a modern efi system with aquamist... Feb 10 2013, 01:49 AM Racer Chris I had a 10.5:1 engine in my street 914 for a coupl... Feb 10 2013, 09:39 AM Tom_T
I build 10.5:1 /6 engines pretty regularly. 93 o... Feb 10 2013, 02:20 PM euro911 When I mentioned the case, I should have elaborate... Feb 10 2013, 03:52 PM Mark Henry On the other end of the scale the 2007cc Gene Berg... Feb 10 2013, 11:02 PM r_towle
On the other end of the scale the 2007cc Gene Ber... Feb 11 2013, 02:37 PM Bleyseng a 2056 with 9 to 1CR with the right cam and valves... Feb 11 2013, 01:14 PM r_towle
I build 10.5:1 /6 engines pretty regularly. 93 o... Feb 11 2013, 02:40 PM |
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