 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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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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| Valy |
Feb 9 2013, 10:36 PM
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
It's all about the cam you use. Longer duration requires higher compression.
You want to be around 8:1 dynamic compression. Search the web for dynamic compression calculators. If you just increase the compression without a longer duration cam, your HP improvement will be really small, like few HP only. |
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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
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 rick 918-S No short answer Joe. Here's my short answer. 1... Feb 10 2013, 12:31 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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