 1.7 heads on a 2.0?, building a autcross, hill climb motor |
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| usa4cheer |
 Apr 18 2006, 10:33 AM
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#1
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Newbie  Group: Members Posts: 29 Joined: 16-February 06 From: richmond, va Member No.: 5,592  |
putting together a 914 for autocross and hillclimbs,
have 2.0 motors but all the heads are bad, have plenty of 1.7 heads, I have heard that this gives a little more torque... ??? don't have the money for 2.0 heads right now, but need the car done by snowshoe hillclimb, what do you think? |
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| Aaron Cox |
Apr 18 2006, 10:52 AM
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#2
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
2.0 heads are worth a good percetage more HP.
i want to say 12% is what i read. |
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| 914Sixer |
Apr 18 2006, 11:18 AM
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#3
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Fly cut the 1.7 heads for 2.0 cylinders and add 2.0 valves. Then the only difference is the bolt pattern.
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| Aaron Cox |
Apr 18 2006, 11:29 AM
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#4
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
QUOTE(914Sixer @ Apr 18 2006, 10:18 AM)  Fly cut the 1.7 heads for 2.0 cylinders and add 2.0 valves. Then the only difference is the bolt pattern. wrong. in addition to 3 vs 4 bolt, THE spark plug angle is way different which is good for mo power. |
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| davep |
Apr 18 2006, 11:53 AM
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#5
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914 Historian Group: Benefactors Posts: 5,143 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
QUOTE Fly cut the 1.7 heads for 2.0 cylinders and add 2.0 valves. Then the only difference is the bolt pattern. The combustion chamber may to too small, and would bump up the CR. This may or may not be good. Port sizes may also be smaller. |
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| usa4cheer |
Apr 19 2006, 09:19 AM
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#6
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Newbie Group: Members Posts: 29 Joined: 16-February 06 From: richmond, va Member No.: 5,592 |
i appreciate the input, i guess i will have to bite the bullet and see if any of the 2.0 heads can be salvaged by another shop, the first one said they were not
thanks |
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| davep |
Apr 19 2006, 03:04 PM
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#7
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914 Historian Group: Benefactors Posts: 5,143 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
QUOTE(usa4cheer @ Apr 19 2006, 07:19 AM) see if any of the 2.0 heads can be salvaged by another shop The best shop to send them to may be: http://www.haminc.biz/main.shtml |
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| Brad Roberts |
Apr 19 2006, 04:04 PM
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#8
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
I would definately go the route of the 2.0 heads. They flow MUCH better straight out of the box than the 1.8's and 1.7's. The rebuild cost is pretty much the same. About the only issue that is really difficult ot overcome for rebuilders: if the 2.0 heads have been flycut too many times, the combustion chamber gets thin near the bottom of one of the exhaust studs.
Take some pics.. show us your 2.0 heads up close. B |
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| Jake Raby |
Apr 19 2006, 08:34 PM
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#9
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
T- minus 10 days and counting!
Nothing will ever be the same again..... |
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| Ctrout |
Apr 19 2006, 08:47 PM
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#10
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Member Group: Members Posts: 377 Joined: 20-May 04 From: Mountain Home, ID. Member No.: 2,091 |
That's really mean Jake!
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