I have been spending the past 3 days sanding, painting and secondcoating my hull with fresh ablative paint, Pettit Ultima 40sr, (very impresed with it so far)
While doing so I have had lots of time to mullxideas over. Some months back Mr Neptume, in a thread about fuel imjection,, gave a wonderful explenation of why ourncarbs are actually a bit oversized and the busimess reasons for that.
In a later thread a conversation came.up about some a4's, produced fo r use in Canada which had a smaller venturi in the carb to bring the hp down to 25 hp.
This seems to contradict Dave's asertion that a slightly smaller.carb would be better.( Very important point here, I am nlt challqnging Dave's knowledge at all on this subject.) But if a smaller venturi reduced the hp to 25 there seems to be contradiction.
Back in my wild youth the first step we would take to bump power kn our cars or motorcycles was to add a bigger carb. For example a very close friend had a Corvair 6 cyl with a factory rig running 4 2 barel carbs. My own chevy 283 came with a 2 barrelxbut with an adapter plate and a 4 barrel carb it look on a new life.
Im womdering is anyone has experemented with a reworked venturi, larger throat, with a larger main jet or adjustable jet.
The fact is nomatter what we are never going to get much more speed under power due to our hull designs and trying to do so just eats up gobs of gas. However developing more umph at lower rpms (torque?) could be beneficial.
On my t30 Im very prop restricted But if I put in a new and longer shaft with a strut I could go to a larger prop then the indigo which may very well help me to have more lower due to the more.effeciant prop.
Of course all of this could.be the byproduct of dust and fumes that got past my mask.
Praise the Lord, its been warm.all.week and Im very close to splashing the boat!
While doing so I have had lots of time to mullxideas over. Some months back Mr Neptume, in a thread about fuel imjection,, gave a wonderful explenation of why ourncarbs are actually a bit oversized and the busimess reasons for that.
In a later thread a conversation came.up about some a4's, produced fo r use in Canada which had a smaller venturi in the carb to bring the hp down to 25 hp.
This seems to contradict Dave's asertion that a slightly smaller.carb would be better.( Very important point here, I am nlt challqnging Dave's knowledge at all on this subject.) But if a smaller venturi reduced the hp to 25 there seems to be contradiction.
Back in my wild youth the first step we would take to bump power kn our cars or motorcycles was to add a bigger carb. For example a very close friend had a Corvair 6 cyl with a factory rig running 4 2 barel carbs. My own chevy 283 came with a 2 barrelxbut with an adapter plate and a 4 barrel carb it look on a new life.
Im womdering is anyone has experemented with a reworked venturi, larger throat, with a larger main jet or adjustable jet.
The fact is nomatter what we are never going to get much more speed under power due to our hull designs and trying to do so just eats up gobs of gas. However developing more umph at lower rpms (torque?) could be beneficial.
On my t30 Im very prop restricted But if I put in a new and longer shaft with a strut I could go to a larger prop then the indigo which may very well help me to have more lower due to the more.effeciant prop.
Of course all of this could.be the byproduct of dust and fumes that got past my mask.
Praise the Lord, its been warm.all.week and Im very close to splashing the boat!
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