Expiremental OM617 build
Expiremental OM617 build
10-12-2016, 06:54 AM
#28
as for the rpm increase vs BSFC the reduction is not an independent variable. it falls on its face for a few reasons the reduction in VE due to the horrible flow of the head. this combined with the restrictions in the pre-chambers preventing the expansion of the combustion into the chamber fast enough, and the timing mechanism not advancing far enough. i have worked on most of these things already and intend to keep experimenting as i go. the need for high boost to get enough air into the engine is solved with aggressive porting and a better cam. those are two of the things im working on, theres a lot more to be done too that may help get this engine to perform closer to its more modern brothers.
i have a rather large water to air set up im installing later this week the core is 11X6X4.5 so i don't see out growing that one for a while.
im running a HE221W right now if i go for compounds in the future ill probably go away from holset turbos at least for the HP turbo. their turbos tend to be optimized for a wide map combined with fast spool that pushes the compressor efficiency quite far down. with compounds you want turbos that are efficient in a smaller band due to the narrow operating band that each one actually sees.
as for the rpm increase vs BSFC the reduction is not an independent variable. it falls on its face for a few reasons the reduction in VE due to the horrible flow of the head. this combined with the restrictions in the pre-chambers preventing the expansion of the combustion into the chamber fast enough, and the timing mechanism not advancing far enough. i have worked on most of these things already and intend to keep experimenting as i go. the need for high boost to get enough air into the engine is solved with aggressive porting and a better cam. those are two of the things im working on, theres a lot more to be done too that may help get this engine to perform closer to its more modern brothers.
i have a rather large water to air set up im installing later this week the core is 11X6X4.5 so i don't see out growing that one for a while.
Messages In This Thread
Expiremental OM617 build - by R-3350 - 07-26-2016, 06:34 PM
RE: Expiremental OM617 build - by R-3350 - 07-27-2016, 06:16 PM
RE: Expiremental OM617 build - by raysorenson - 07-27-2016, 07:24 PM
RE: Expiremental OM617 build - by R-3350 - 07-27-2016, 07:49 PM
RE: Expiremental OM617 build - by raysorenson - 07-28-2016, 07:41 AM
RE: Expiremental OM617 build - by raysorenson - 07-28-2016, 08:01 AM
RE: Expiremental OM617 build - by R-3350 - 07-28-2016, 12:38 PM
RE: Expiremental OM617 build - by MFSuper90 - 07-29-2016, 06:11 AM
RE: Expiremental OM617 build - by R-3350 - 07-29-2016, 12:16 PM
RE: Expiremental OM617 build - by MFSuper90 - 07-29-2016, 04:13 PM
RE: Expiremental OM617 build - by R-3350 - 07-29-2016, 04:35 PM
RE: Expiremental OM617 build - by R-3350 - 07-29-2016, 06:24 PM
RE: Expiremental OM617 build - by R-3350 - 08-17-2016, 03:58 PM
RE: Expiremental OM617 build - by R-3350 - 08-22-2016, 06:41 PM
RE: Expiremental OM617 build - by R-3350 - 09-30-2016, 11:24 PM
RE: Expiremental OM617 build - by CRD4x4 - 10-01-2016, 09:10 AM
RE: Expiremental OM617 build - by R-3350 - 10-01-2016, 10:18 AM
RE: Expiremental OM617 build - by NZScott - 10-01-2016, 03:20 PM
RE: Expiremental OM617 build - by R-3350 - 10-03-2016, 10:53 PM
RE: Expiremental OM617 build - by SurfRodder - 10-04-2016, 12:24 AM
RE: Expiremental OM617 build - by MFSuper90 - 10-09-2016, 07:51 AM
RE: Expiremental OM617 build - by R-3350 - 10-09-2016, 08:57 AM
RE: Expiremental OM617 build - by NZScott - 10-09-2016, 05:38 PM
RE: Expiremental OM617 build - by R-3350 - 10-09-2016, 06:43 PM
RE: Expiremental OM617 build - by NZScott - 10-10-2016, 01:45 AM
RE: Expiremental OM617 build - by atypicalguy - 10-12-2016, 04:14 AM
RE: Expiremental OM617 build - by atypicalguy - 10-12-2016, 04:32 AM
RE: Expiremental OM617 build - by R-3350 - 10-12-2016, 06:54 AM
RE: Expiremental OM617 build - by atypicalguy - 10-12-2016, 05:16 PM
RE: Expiremental OM617 build - by atypicalguy - 10-12-2016, 08:32 AM
RE: Expiremental OM617 build - by R-3350 - 10-12-2016, 07:42 PM
RE: Expiremental OM617 build - by atypicalguy - 10-15-2016, 09:56 AM
RE: Expiremental OM617 build - by R-3350 - 10-20-2016, 09:33 PM
RE: Expiremental OM617 build - by NZScott - 10-21-2016, 12:34 AM
RE: Expiremental OM617 build - by R-3350 - 11-19-2016, 04:15 PM
RE: Expiremental OM617 build - by atypicalguy - 02-19-2018, 09:58 PM
RE: Expiremental OM617 build - by TKMad - 11-21-2016, 04:11 PM
RE: Expiremental OM617 build - by NZScott - 11-21-2016, 09:05 PM
RE: Expiremental OM617 build - by R-3350 - 11-21-2016, 09:30 PM
RE: Expiremental OM617 build - by NZScott - 11-22-2016, 01:07 AM
RE: Expiremental OM617 build - by MFSuper90 - 11-24-2016, 10:35 AM
RE: Expiremental OM617 build - by R-3350 - 11-24-2016, 12:01 PM
RE: Expiremental OM617 build - by Evenglass - 12-18-2016, 11:01 PM
RE: Expiremental OM617 build - by R-3350 - 12-19-2016, 10:29 PM
RE: Expiremental OM617 build - by DiseaselWeasel - 12-26-2016, 04:09 AM
RE: Expiremental OM617 build - by R-3350 - 06-08-2017, 10:46 PM
RE: Expiremental OM617 build - by R-3350 - 06-09-2017, 10:51 PM
RE: Expiremental OM617 build - by R-3350 - 10-27-2017, 07:59 AM
RE: Expiremental OM617 build - by atypicalguy - 10-29-2017, 08:54 PM
RE: Expiremental OM617 build - by atypicalguy - 11-16-2017, 09:43 PM
RE: Expiremental OM617 build - by R-3350 - 11-16-2017, 11:17 PM
RE: Expiremental OM617 build - by atypicalguy - 11-19-2017, 12:52 AM
RE: Expiremental OM617 build - by R-3350 - 11-19-2017, 02:59 AM
RE: Expiremental OM617 build - by atypicalguy - 11-21-2017, 09:25 PM
RE: Expiremental OM617 build - by MFSuper90 - 12-17-2017, 11:09 PM
RE: Expiremental OM617 build - by atypicalguy - 12-26-2017, 02:41 PM
RE: Expiremental OM617 build - by R-3350 - 02-19-2018, 10:43 PM
RE: Expiremental OM617 build - by R-3350 - 03-07-2018, 01:36 AM
RE: Expiremental OM617 build - by atypicalguy - 03-10-2018, 07:10 PM
RE: Expiremental OM617 build - by R-3350 - 03-11-2018, 12:53 AM
RE: Expiremental OM617 build - by atypicalguy - 03-13-2018, 06:37 AM
RE: Expiremental OM617 build - by R-3350 - 03-14-2018, 07:58 PM
RE: Expiremental OM617 build - by R-3350 - 01-10-2019, 12:43 PM
RE: Expiremental OM617 build - by NZScott - 01-10-2019, 03:05 PM
RE: Expiremental OM617 build - by atypicalguy - 03-02-2019, 07:31 AM
RE: Expiremental OM617 build - by NZScott - 03-02-2019, 03:41 PM
RE: Expiremental OM617 build - by R-3350 - 03-02-2019, 05:16 PM
RE: Expiremental OM617 build - by atypicalguy - 03-02-2019, 08:50 PM
RE: Expiremental OM617 build - by R-3350 - 03-02-2019, 10:46 PM
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