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Old 07-11-2018, 12:26 PM   #1
swedishK
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Default Penta 2.5L B21ft?

I might have a line on a cheap aq151 possibly two, and was wondering if Id run into any issues swapping the 2.5 block into my turbo kjet wagon. Ive seen b230 heads on 2.1 blocks, so Im assuming theyd go the other way as well? Will a mildly modified turbo kjet fuel system be adequate to keep up with 400 extra CCs? The motors have been sitting outside on a pallet for a bit, and will probably need a full rebuild. Is the extra displacement worth the effort?


Now Im unsure if theyre actually 2.5 blocks. One has a 531 head and the other has what appears to be a 405. Both single carb. I did not see any AQ designation on the ID tag by the starter, however both tags start with the prefix 250A.
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Old 07-11-2018, 05:24 PM   #2
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Single carb penta will have the A cam. The AQ151 is the 16V penta. You are looking at two types probably a pre B230 block one with the 405 head and a B230 based one with the 531 head. I think they may have also called them AQ130 or AQ131.

You may have to drill some holes for a sensor or two. But the block and head would work for a buildup. Or you could use the heads if they aren't engines with the longer crank throw. Make sure you check that number four exhaust port. My penta sourced 531 needed a good bit of welding to repair it from corrosion.
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Old 07-11-2018, 05:52 PM   #3
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aq250 are b230 blocks and are 8v 2.5l
aq251 are b230 blocks with 16v heads

they started numbering aq250 after 92 i think
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Old 07-11-2018, 09:02 PM   #4
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so if i can get one for $100 i should go for it eh?
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Old 07-11-2018, 11:52 PM   #5
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That's a very fair price just for parts. Have fun with it.
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Old 07-12-2018, 12:42 AM   #6
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The AQ151 is the 16V penta.
AQ171?
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Old 07-12-2018, 12:57 AM   #7
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Buy it before someone else does!
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Old 07-12-2018, 01:41 AM   #8
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Buy it before someone else does!
You buy that **** when you see it
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Old 07-12-2018, 02:21 AM   #9
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That's a very fair price just for parts. Have fun with it.
Fair? Thats a steal at that price.
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Old 07-12-2018, 02:36 AM   #10
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picking up two 250a motors on friday. $100 a piece. will update on condition when i can dig into them.
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Old 07-12-2018, 03:26 AM   #11
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Originally Posted by dl242gt View Post
Single carb penta will have the A cam. The AQ151 is the 16V penta. You are looking at two types probably a pre B230 block one with the 405 head and a B230 based one with the 531 head. I think they may have also called them AQ130 or AQ131.

You may have to drill some holes for a sensor or two. But the block and head would work for a buildup. Or you could use the heads if they aren't engines with the longer crank throw. Make sure you check that number four exhaust port. My penta sourced 531 needed a good bit of welding to repair it from corrosion.
AQ151 is the 8 valve 2.5 liter stroker engine, essentially an early 250A. The AQ171 is the 16 valve 2.5 liter stroker, which became the 251A. In the early years, the number was the horsepower the engine provided. Case in point, the AQ255 V8 engine was not a 4.2 liter V8, but a Chevy 350 smallblock.
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Old 07-13-2018, 06:41 PM   #12
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Any helpful tips for working with a probably saltwater motor that’s been sitting outside on a pallet for a while?
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Old 07-13-2018, 08:48 PM   #13
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Drop it in a big cattle watering tank that is full of oil and let it soak for a week. Or just spray WD all over and in it every day for a few weeks.
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Old 07-13-2018, 10:02 PM   #14
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Drop it in a big cattle watering tank that is full of oil
Marvel Mystery Oil! You might be able to get 10 or 20 gal of it without maxing out your credit card...
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Old 07-14-2018, 01:09 PM   #15
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Probably the most valuable part on those is the crankshaft, they would both be rear thrust and forged steel and stroking on the shaft rods are stock, pistons have shorter crown for longer stroke. Should be able to get the crank out easily enough. Hard parts can be the boat exhaust manifold, but even if you break the bolts, still will come off. Basically you need to get the head off if you wanna put the short block in your car. All the boat motors I've ever had where like new inside, real clean. I've never seen a volvo penta redblock boat motor that had salt water running through it. They use a closed coolant system with a heat exchanger. The salt water would run through the exhaust manifold. That is the hardest part to take off, but if you don't need head, you can take off the head with the manifold still attached and just toss it. Cam should be a V cam, but all 250's I've seen had dual carbs and you said these only had single carbs, might be A cam then.
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