 Type-4 engine question, Can bores be swapped? |
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| stewteral |
 Sep 19 2010, 11:23 PM
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#1
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Old Member  Group: Members Posts: 384 Joined: 4-December 07 From: Camarillo, CA Member No.: 8,424 Region Association: Southern California  |
Hey 914ers,
I have a basic "dumb" question: I have a 1.7 engine and am looking at a rebuild. Will the 1.8 liter bores fit into my cases or will machining be required? Are there any other issues involved such as bore height, fitting the heads, fitting the case studs, etc.? Thanks, Terry |
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| Mark Henry |
Sep 19 2010, 11:28 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Fits the case, but the heads would need to be opened up
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| McMark |
Sep 19 2010, 11:34 PM
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#3
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
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| rhcb914 |
Sep 20 2010, 08:18 AM
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#4
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member Group: Members Posts: 358 Joined: 3-February 04 From: Boston, MA Member No.: 1,626 |
If you looking for more displacement I would go with a 96mm big bore kit for the 1.7/1.8 (66mm stroke). As mentioned above if you are using 1.7 heads you will need to have them opened up to fit. If you use the 1.8 or 2.0 heads they will slip right on.
All cases 1.7, 1.8 and 2.0 have the same diameter. |
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| stewteral |
Sep 20 2010, 06:55 PM
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#5
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Old Member Group: Members Posts: 384 Joined: 4-December 07 From: Camarillo, CA Member No.: 8,424 Region Association: Southern California |
QUOTE(rhcb914 @ Sep 20 2010, 07:18 AM)  If you looking for more displacement I would go with a 96mm big bore kit for the 1.7/1.8 (66mm stroke). As mentioned above if you are using 1.7 heads you will need to have them opened up to fit. If you use the 1.8 or 2.0 heads they will slip right on. All cases 1.7, 1.8 and 2.0 have the same diameter. Hey rhcb914, Thanks for your response! Surely the 96mm bores while enticing, will require machining of the cases...yes? BTW: who is a good source for these bore & piston sets? Best, Terry |
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| 914Sixer |
Sep 20 2010, 07:01 PM
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#6
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914 Guru Group: Members Posts: 8,886 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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No machining of the case for 96mm. Heads only.
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| Mark Henry |
Sep 20 2010, 07:02 PM
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#7
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(stewteral @ Sep 20 2010, 08:55 PM) QUOTE(rhcb914 @ Sep 20 2010, 07:18 AM) If you looking for more displacement I would go with a 96mm big bore kit for the 1.7/1.8 (66mm stroke). As mentioned above if you are using 1.7 heads you will need to have them opened up to fit. If you use the 1.8 or 2.0 heads they will slip right on. All cases 1.7, 1.8 and 2.0 have the same diameter. Hey rhcb914, Thanks for your response! Surely the 96mm bores while enticing, will require machining of the cases...yes? BTW: who is a good source for these bore & piston sets? Best, Terry No case machining, but many do spot face the bore seating surface, the 1.7 heads would still need boring. |
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