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Registered
Join Date: Oct 2018
Posts: 94
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2.4 vs 2.7 vs 3.2 rebuild costs variance?
Good morning - assuming same/same condition is 2.4 or 3.2 that much less to rebuild to a street engine (not race) level?
Assuming that the engine is basically in decent but tired condition is there a big cost swing between the different flavors of engine? Thanks. |
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,492
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The basic costs are about the same, meaning new parts and machine work costs are near equal.
The cost variance comes in the magnesium case of the 2.4. Long term the mag case 2.7 could require lots of extra work to straighten for the build. Mag case can be a bottomless pit with line bore, case saver and new studs and machine work required The long term residual value is in the aluminum cases With the 3.2, make sure you get all the electrics to make it runable Bruce Last edited by Flat6pac; 01-07-2020 at 08:49 AM.. |
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Registered
Join Date: Oct 2018
Posts: 94
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Thanks for the reply.
So, basically, if all the other costs are close to equivalent why not build a bigger engine with an aluminum case and avoid the potential magnesium case issues/work required at some point. Is that about right? Last edited by SoCal_Lynch; 01-07-2020 at 03:27 PM.. |
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Ingenieur
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I think your understanding is right on. It is possible to rebuild a 3.2L without machining most of the time. A 2.7 is much less stable.
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Registered
Join Date: Oct 2018
Posts: 94
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Thanks
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Registered
Join Date: Feb 2004
Location: denver
Posts: 1,147
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I would add that the fuel systems, both carburetors and MFI on early engines can be expensive if they need attention as well.
john |
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Registered
Join Date: Oct 2018
Posts: 94
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I had not thought about that John, good point.
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Registered
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I wanted to build a 2.8 SS out of my 2.2 (71T) using a 7R case. By the time I factored in the costs and potential leakage on the 2.7 I bought a decent used SC engine. ... job has mushroomed to a 964 based 3.8 ... another story
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Registered
Join Date: Oct 2008
Location: Denver, CO
Posts: 3,494
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only other factor is overall package value if the 2.4 or 2.7 is original to the car (numbers matching)
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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The big question mark with an SC or Carrera motor is cylinder type. If you have a motor with Mahle cylinders, there is a very good chance they can be reused.
On the other hand, with KS cylinders most will say they should be nikasil plated and used with new pistons. That can be around $2K more than reusing good cylinders.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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