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Thread: convert HPDI to a OX66
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02-08-2012, 10:44 PM #1
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convert HPDI to a OX66
can a hpdi be converted to a ox66 I know the heads will fit and injection will bolt on but will it work I think it would probubly run lean because the diference in the 3.1 and the 3.3 any info would be appreceated
Mal
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02-08-2012, 10:59 PM #2
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Better off getting an ox66 drop on
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02-09-2012, 09:54 AM #3
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no different blocks all around different crank too.
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02-10-2012, 11:07 PM #4
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Chris he is talking about a 3.3,been running a 3.1 on a 3.3 leg for years now
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02-11-2012, 07:09 AM #5
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Eric,dose'nt the hpdi use a crank with different journal locations than the Efi motor?
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02-11-2012, 07:26 AM #6
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Nope...You can run a 3.3 front half on the 3.1 block with no problem.
Originally Posted by Chris Carson's Marine
Given the power that you can make from the 3.1 with stock electronics/fuel system I don't think you would have a lean issue (especially since the OX has an oxygen sensor)...but I don't see why you'd want to change...'08 SRV
Yamaha 3.1 Phase III
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02-11-2012, 08:02 AM #7
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Dok,I stand corrected...the 90 degree ox66 and hpdi"s use different cranks,but the 76 degree motors aparrently share the same crank,whats the difference\exchangability between the 3.1 and 3.3?,Chris
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02-11-2012, 08:26 AM #8
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the 2.6 efi an hpdi use different cranks but the 3.1 an 3.3 ues the same! ive done lots of them!
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02-11-2012, 08:32 AM #9
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The 3.3 is basically a big bore version of the 3.1. The 300 has an extra reed (which I'm sure you are aware of lol). Originally Posted by Chris Carson's Marine
'08 SRV
Yamaha 3.1 Phase III
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02-11-2012, 09:24 AM #10
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HUMMM...would the reed block form a 300 (with the extra reed) interchange on to a 3.1 EFI then perhaps? or does it not match up? Originally Posted by DoktorC
1990 22' Activator Yami HPDI 300-sold-86.4
1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
1982 21' Superboat 300merc-87
1990 22' Activator yami OX66 Vmax 250-84.2
1982 30' Scarab-twin 200 Merc-sold
1979 21' Challenger 300 Evenrude-sold
1979 21' Superboat 200 Merc-sold-72
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02-11-2012, 09:34 AM #11
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You need the front half from the 300...there isn't enough room for the extra reed to fit in the stock hole Originally Posted by dnelson964
.
'08 SRV
Yamaha 3.1 Phase III
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02-11-2012, 09:49 AM #12
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Originally Posted by DoktorC
You need the front half from the 300...there isn't enough room for the extra reed to fit in the stock hole.
Thanks for confirming that. I was wishfully thinking for a moment.
Last edited by dnelson964; 02-11-2012 at 09:52 AM.
1990 22' Activator Yami HPDI 300-sold-86.4
1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
1982 21' Superboat 300merc-87
1990 22' Activator yami OX66 Vmax 250-84.2
1982 30' Scarab-twin 200 Merc-sold
1979 21' Challenger 300 Evenrude-sold
1979 21' Superboat 200 Merc-sold
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02-11-2012, 09:54 AM #13
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thanks all,chris
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02-12-2012, 12:27 PM #14
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Any idea how/why the HPDI doesn't have an O2 sensor?
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02-13-2012, 10:14 AM #15
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To save money, I assume. Originally Posted by engineermike
If I remember correctly, the 2.6 liter HPDI engines had O2 sensors, but when the HDPI big blocks came out a few years later, they did not.Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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