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Message |
Forum: TECH TALK Topic: 56 cu in omc exhaust tuner mods |
| hec2buck |
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Posted: June 8th, 2016, 4:14 pm
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Replies: 11
Views: 6986
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| Yes, but if you match port the exhaust port to the block you end up with the same port height as the SST-60 (1.450"), with chamfer 1.393". So in reality, the SST-60 Spec. was used by those that ran the oval port on V's and turned 7500 rpm. The chamfer is a must and it should peak at the ap... |
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Forum: TECH TALK Topic: 56 cu in omc exhaust tuner mods |
| hec2buck |
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Posted: June 7th, 2016, 10:31 am
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Replies: 11
Views: 6986
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| :) Use the SST-60 tuner on the oval port motor as well as the bridgeport if you want more top end. In addition alter the ports to the SST-60 specs (1.450" without chamfer, & 1.393" to top of chamfer). You want to chamfer the upper lip of the exhaust port at about a 30-45 degree angle t... |
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Forum: TECH TALK Topic: can someone please explain the 56 cu in jet theory to me. |
| hec2buck |
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Posted: June 7th, 2016, 10:18 am
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Replies: 33
Views: 5910
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| :) Yes, the reason the plastic top carbs have smaller hi speed jets (52D's) is due to the supplemental fuel entering through the intermediate circuit (60D's). The metal carbs (large bore) from the SST-60 have no intermediate circuit and run 73D's for the hi speed.. The 33 air bleeds on the metal car... |
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Forum: TECH TALK Topic: 56cu in cylinder head skim for more power ? |
| hec2buck |
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Posted: June 3rd, 2016, 8:54 am
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Replies: 5
Views: 1931
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 Glad to help.
Thom |
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Forum: TECH TALK Topic: 56cu in cylinder head skim for more power ? |
| hec2buck |
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Posted: June 2nd, 2016, 2:22 pm
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Replies: 5
Views: 1931
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| Almost forgot to mention there are aftermarket gaskets that are .015" thicker than the stock OEM gaskets. Sierra Supply is one source to check out. |
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Forum: TECH TALK Topic: 56cu in cylinder head skim for more power ? |
| hec2buck |
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Posted: June 2nd, 2016, 2:19 pm
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Replies: 5
Views: 1931
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| :? First, raising the compression will not give you more top end speed. You will gain low & mid range torque for better acceleration, but not gain on the big end. You can mill as much as .0125" or 3+ mm and not have water jacket issues. The SST-60 has a pocket depth of 0.450" +/-.010&q... |
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Forum: TECH TALK Topic: Help - Porpoising J-Craft |
| hec2buck |
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Posted: May 18th, 2016, 2:25 pm
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Replies: 8
Views: 3439
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| You need to check bottom 4-6ft up from transom with a carpenters' level. If there are any air gaps between level and hull, that could cause problems. Usually a bow in the bottom or a rocker bottom will cause the bouncing. Any air gaps that exceed .015-.020" needs to be addressed. |
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Forum: TECH TALK Topic: trying to read the plugs !!! |
| hec2buck |
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Posted: May 17th, 2016, 9:01 am
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Replies: 8
Views: 2040
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| Also, the adjustable low speed should be set at 2-2 1/2 turns out for best idle. |
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Forum: TECH TALK Topic: trying to read the plugs !!! |
| hec2buck |
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Posted: May 17th, 2016, 9:00 am
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Replies: 8
Views: 2040
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| The 60D's are the intermediate air jets. If you go smaller in size, you will get less air, so the mid range will be richer. The hi speeds are the 52D's. They are fuel jets and the smaller you go the leaner you get. I would try going to 53 or 54D's in the hi speed jets. You can order them from any BR... |
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Forum: CBF Topic: 1986 Dunnville ..some people you know |
| hec2buck |
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Posted: May 16th, 2016, 2:51 pm
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Replies: 17
Views: 5570
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 Ahhhh the parties. Yes, the best boat races I ever went to from 1986 to 1992. TORC needs to talk to the Dunnville Boat Club about the return of " Thunder on the Grand". Were "all in" right Jim! |
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