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AQ 120b upgrades.

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Redjmp

New member
I have an AQ120b in a 2270 explorer that needs a little extra.
My understanding is that this is the smallest engine in the red block series at 2.1 L. Not sure but I think it is 108hp.
I understand that there are 2.3 and 2.5L blocks used as well.
Are these interchangeable?
I mean will all the accessories bolt on?
Is there anything I can do to get some more power out my block without having to swap the block to a bigger one?
I just spent a small fortune completely rebuilding it with imported pistons and parts and it runs so well and economically!
I get 5mpg at 1500rpm at 5 knots but can only get up to 17 knots at 4800.
Would be nice to get at least 20 knots out of the old girl.
Can I swap to a dual carb setup or maybe a 16 valve head?
 
Redjmp said:
I have an AQ120b in a 2270 explorer that needs a little extra.
My understanding is that this is the smallest engine in the red block series at 2.1 L. Not sure but I think it is 108hp.
I understand that there are 2.3 and 2.5L blocks used as well.
Are these interchangeable?
I mean will all the accessories bolt on?
Is there anything I can do to get some more power out my block without having to swap the block to a bigger one?
I just spent a small fortune completely rebuilding it with imported pistons and parts and it runs so well and economically!
I get 5mpg at 1500rpm at 5 knots but can only get up to 17 knots at 4800.
Would be nice to get at least 20 knots out of the old girl.
Can I swap to a dual carb setup or maybe a 16 valve head?
Click to expand...
I should add that I may be able to get my hands on an AQ151B with a bent rod.
Can I start by swapping the intake and carbs or will the whole head bolt up?
Then I suppose I should look for a newer 2.5L short block with the better thrust bearings and build a 151C engine?
And whats a "D" engine....?
 
I'd say your hull is grossly underpowered when considering your objectives....

Since you just made it a major investment and it is economical, enjoy it for what it is and, if you still desire more speed, go buy a small, light boat with a big outboard...it will be much more economical in the long run...
 
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