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Old 12-25-2012, 05:19 PM   #1
mark244turbo
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Default Low-comp 2.5L 16v turbo engine.

Somebody tried building a 2.5L 16v turbo engine using a B230+16v or B234F engine with AQ151 internals?

I did some calculations and came to a healthy 8.6:1 SCR for the AQ151 pistons with a B234F head. A little over the 8.2:1 of the B204FT engine.

AQ151 with 531 head (53.7 cc chamber), 9.7:1
B234F head (64 cc chamber), drops the SCR to around 8.6:1

Are there any downsides in using AQ151 pistons instead of custom aftermarket pistons?
Also will the AQ151 crankshaft drop in a B234F engine or do i need a B230 block?

Correction: I cc-ed a B234F head and the actual chamber size is 48,5 cc, so fitting a B234F head to a AQ151 engine would actually raise compression.

Last edited by mark244turbo; 05-11-2014 at 10:37 AM..
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Old 12-25-2012, 05:51 PM   #2
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If you use aftermarket pistons woukd would need different longer rods.
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Old 12-25-2012, 05:54 PM   #3
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b234 external oil pump isnt it? drop it in a b230 and run the internal pump
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Old 12-25-2012, 07:18 PM   #4
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Originally Posted by 77volvo245 View Post
If you use aftermarket pistons woukd would need different longer rods.
That's something i'd like to avoid. Because i allready bought 152 mm H-beams.
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Old 12-25-2012, 07:26 PM   #5
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Originally Posted by sleepySOHC View Post
b234 external oil pump isnt it? drop it in a b230 and run the internal pump
The B234F has an external oil pump. It's got a bigger capacity than the B230 pump, and it's also used in the B204FT engines (2.0L 16v turbo redblock). If it works for the B204FT and B234F engine i think it will work in a B254FT engine as well.
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Old 12-25-2012, 09:04 PM   #6
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...but then you have that little belt drive to worry about.
If its more oil pressure youre after, change the relief spring or shim the existing one.
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Old 12-25-2012, 11:55 PM   #7
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Originally Posted by ryanfay View Post
...but then you have that little belt drive to worry about.
If its more oil pressure youre after, change the relief spring or shim the existing one.
this, what if that belt goes boom? you have a decent amount of money and that belt is whats keeping it together. ipd sells a spring for the i believe (b20ft?) and will fit in the b230s pump for higher pressure
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Old 12-26-2012, 12:06 AM   #8
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The oil pressure gain was about 10psi with the B20 spring from IPD.

My old B230 with 16v head with RSI pistons and 2.5L stroker crank added up to about 8.7 static compression.
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Old 12-26-2012, 12:16 AM   #9
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Old 12-26-2012, 09:43 AM   #10
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Nice to see the AQ151 pistons with B234F head have almost the same compression as the RSI 16v turbo pistons.

The main reason i want to use the B234F engine is because it bolts right in place of the B204FT engine it's going to replace. No need to change the crossmember. Only the engine, clutch and gearbox (M46+OD => M90).

On the other hand, if i can reduce the risk of a belt snapping, that would be a good reason to use a B230 block instead.

Last edited by mark244turbo; 12-29-2012 at 08:16 PM.. Reason: Mixed up b20 and b200 parts.
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Old 12-26-2012, 03:04 PM   #11
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best bet find a squirter block maybe on ebay or if somehow on pops in the junkyard snag it up and have a machine shop clean/deck/bore whatever it needs. i dont think itd be anything other then b200ft motor mounts and if the tranny crossmember was different. imho id go b200ft block just for the reassurance that my $$$ motor isnt going to spin a bearing or overheat due to a belt. but then again these blocks are everywere over in the states
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Old 12-28-2012, 12:54 AM   #12
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Quote:
Originally Posted by mark244turbo View Post
Somebody tried building a 2.5L 16v turbo engine using a B230+16v or B234F engine with AQ151 internals?

I did some calculations ...
AQ151 with 531 head (53.7 cc chamber), 9.7:1
B234F head (64 cc chamber), drops the SCR to around 8.6:1

Are there any downsides in using AQ151 pistons instead of custom aftermarket pistons?
I'm working on doing this. Already have an AQ151C engine, but I'm wondering about pistons as well. Seems like if you're going the B234/AQ171 route you're pretty well set. I'm just going to stay with the 531, but I feel the CR is little on the high side. I'd like to stay with stock length rods (H-beam or X-beam or laser beam or whatever) so it's either make do with the stock pistons or find forged aftermarket ones. I think I know a certain somebody in Seattle who'd probably sell a set or two.
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Old 12-28-2012, 05:49 PM   #13
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Quote:
Originally Posted by nathaninwa View Post
The oil pressure gain was about 10psi with the B20 spring from IPD.

My old B230 with 16v head with RSI pistons and 2.5L stroker crank added up to about 8.7 static compression.
What turbo did you use on this setup?
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Old 12-29-2012, 08:05 PM   #14
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Quote:
Originally Posted by gtlover View Post
I'm working on doing this. Already have an AQ151C engine, but I'm wondering about pistons as well. Seems like if you're going the B234/AQ171 route you're pretty well set. I'm just going to stay with the 531, but I feel the CR is little on the high side. I'd like to stay with stock length rods (H-beam or X-beam or laser beam or whatever) so it's either make do with the stock pistons or find forged aftermarket ones. I think I know a certain somebody in Seattle who'd probably sell a set or two.
What kind of forged aftermarket pistons do you want to buy? Penta AQ151-pistons are 3 mm shorter than volvo's B230 pistons, so they are not interchangable!
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Old 12-31-2012, 12:17 AM   #15
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Quote:
Originally Posted by mark244turbo View Post
What kind of forged aftermarket pistons do you want to buy? Penta AQ151-pistons are 3 mm shorter than volvo's B230 pistons, so they are not interchangable!
Excellent question! One which I have only barely begun to research. Dave Barton got the pistons for his stroker motor from Wiseco, so there's a start. RSI and JVAB probably have something too. I was already aware of the shorter pistons (which allow standard length rods, for better rod/stroke ratio). I know somebody can make these slugs so it's really just a matter of getting the specs right.
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Old 03-24-2015, 06:56 AM   #16
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Did this ever get finished?
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Old 03-24-2015, 01:41 PM   #17
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Mine is on hold until I have a regular paycheck, but at this point I'm going to"buy local" for pistons and rods. Also found a good marine head specialist to freshen up the 531. Also going to have them bore the ports for head mounted injectors so I can run a B21F intake.
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Old 03-26-2015, 02:10 AM   #18
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Got my aq171 running today.
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