So I have a 97 LPT motor in the garage, which will eventually find its way into my 760. Now, with the bore being slightly larger, I'm wondering if I'm going to see any bore shifting at high boost levels. The motor will be getting custom internals once I get past 300 or so whp, so the next weakpoint I can speculate on is flex in the lovely 850 open-deck. Will "posting" of the cylinders (dunno what other names may be for it, but set screws through the water jacket and in contact with the block...) be enough... has it been done/documented? Anyone running higher boost pressures on an LPT block have any expereince to share?
Performance Weaknesses In An Lpt Motor?
Started by
Guest_Guest_the poi_*_*
, Oct 26 2004 02:12 AM
39 replies to this topic
#2
mAydAy
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Posted 26 October 2004 - 02:25 AM
I don't know if anyoen has gone this far on one of them, but I'd imagine the casting of the block wouldn't be so much of a problem until 400+hp range, until then I'd foresee the rods and pistons as being the big issues...
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#3
850 GLT
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Posted 26 October 2004 - 02:37 AM
I can say that I'm getting fuel cut running higher boost. Still not sure if it's just an ecu problem or something else.
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#4
lax01
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Posted 26 October 2004 - 02:45 AM
mind telling us how you are putting the I5 into the 760?
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#5 Guest_Guest_*
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Posted 26 October 2004 - 03:03 AM
QUOTE(lax01 @ Oct 26 2004, 02:45 AM)
mind telling us how you are putting the I5 into the 760?
Gonna need to score a 960 drivetrain first, but from there, its pretty straightfoward: trans and bellhousing form the 960 (real men can't drive stick!) sump and modification of the oilpan, using 960 motor mounts and it bolts right in. Then from there its just a matter of getting the EMS taken care of.
#6
lax01
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Posted 26 October 2004 - 03:12 AM
seems like a lot of work...are you going to build the block up at all?
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#7
ROB @ VMS
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Posted 26 October 2004 - 03:30 AM
Who can rebuild the block?
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#8 Guest_Guest_*
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Posted 26 October 2004 - 03:46 AM
QUOTE(lax01 @ Oct 26 2004, 03:12 AM)
seems like a lot of work...are you going to build the block up at all?
well, yes, thats the question really. It depends if the 6 cyl block is inherently weaker than the 5. if not (and im not entirely certain how i'll figure that one out) then the 5 will probably go in stock, I'll squeeze out 300-350hp, while the 6cyl gets new internals. Otherwise, the 5 will probably get a good set of guts.
#9
patrick
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Posted 26 October 2004 - 04:24 AM
i think its quite an easy conversion, why not put a manual up to it though? w/ the rwd that'd be a sweet setup
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#10
lax01
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Posted 26 October 2004 - 04:27 AM
QUOTE(Guest @ Oct 25 2004, 10:46 PM)
QUOTE(lax01 @ Oct 26 2004, 03:12 AM)
seems like a lot of work...are you going to build the block up at all?
well, yes, thats the question really. It depends if the 6 cyl block is inherently weaker than the 5. if not (and im not entirely certain how i'll figure that one out) then the 5 will probably go in stock, I'll squeeze out 300-350hp, while the 6cyl gets new internals. Otherwise, the 5 will probably get a good set of guts.
there's no way a stock LPT block is going to hold 350 whp....MAYBE 350 bhp but even then you are pushing the rod-breaking phase...talk to Rob@VMS, he's already hinted that he can re-build the 5 cylinder blocks and make them much much stronger
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#11
850 GLT
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Posted 26 October 2004 - 04:33 AM
QUOTE
there's no way a stock LPT block is going to hold 350 whp....MAYBE 350 bhp but even then you are pushing the rod-breaking phase...talk to Rob@VMS, he's already hinted that he can re-build the 5 cylinder blocks and make them much much stronger
How do you know?
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#12 Guest_Guest_*
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Posted 26 October 2004 - 04:38 AM
QUOTE(lax01 @ Oct 26 2004, 04:27 AM)
there's no way a stock LPT block is going to hold 350 whp....MAYBE 350 bhp but even then you are pushing the rod-breaking phase...talk to Rob@VMS, he's already hinted that he can re-build the 5 cylinder blocks and make them much much stronger
Eh, I'll take my chances, and if it doesnt work, custom internals are an offset grind, DSM rods and some good pistons away. And I noticed Rob hinted that he can "rebuild blocks". And from what I've gathered from vspeed, he can probably shoot monkeys out of his jerk as well.
#13 Guest_Guest_*
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Posted 26 October 2004 - 04:39 AM
ha, that edit turned out hilarious. a++ work word replacement!
#14
pennybridge pioneer
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Posted 26 October 2004 - 04:49 AM
there's two issues being confused here: i believe 'the poi' is asking about strengthening the block itself and if its even necessary, some of you are talking about rebuilding the rotating assembly, which it seems he's already got a grasp on. So maybe if anyone has any worthwhile info they can share that.
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#15
The Poi
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Posted 26 October 2004 - 04:58 AM
heh, cool, all this time and I was actaully registered. carry on!
So anyway: is there some inherent structural weakness in the thinner walls of the LPT blocks. More specifically, has anyone shifted a bore on one of these things?
So anyway: is there some inherent structural weakness in the thinner walls of the LPT blocks. More specifically, has anyone shifted a bore on one of these things?
#16
ROB @ VMS
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Posted 26 October 2004 - 06:28 AM
I wont offer my help then, have fun, its not like VMS is making a 1000hp+ I6
99 C70 5sp
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-Garrett GT3071R Turbo 18-30psi
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- Front mount intercooler W/Custom Pipe
- Hhs Ssq Bov
- Walbro 255lph pump
- RC 550cc Injectors
- -8AN Braided fuel lines
- Rica custom Tuning
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#17
JESSEXC
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Posted 26 October 2004 - 01:28 PM
QUOTE(The Poi @ Oct 25 2004, 11:58 PM)
heh, cool, all this time and I was actaully registered. carry on!
So anyway: is there some inherent structural weakness in the thinner walls of the LPT blocks. More specifically, has anyone shifted a bore on one of these things?
So anyway: is there some inherent structural weakness in the thinner walls of the LPT blocks. More specifically, has anyone shifted a bore on one of these things?
I am nowhere near 350 whp maybe around 245-255? Still need to do some more tuning. A/F on the dyno shows it running rich. I don't see why you shouldn't get close to 350hp with just a set of custom rods. I have heard of someone in the UK pushing 285hp at the wheels with a 16t and a stock block. Anyways I have been pushing anywhere from 13-16 psi for over the past 3 years and 60,000 miles with stock internals. Remember we share the same rods as the 2.3 and they are pushing up to 23 psi on stock internals. Why can't we run up to 18-20 psi and still hold together with the right tuning?
Oh, and Lax please keep to what you know.
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#18
lax01
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Posted 26 October 2004 - 05:46 PM
QUOTE
Oh, and Lax please keep to what you know. dry.gif
QUOTE
there's no way a stock LPT block is going to hold 350 whp....MAYBE 350 bhp but even then you are pushing the rod-breaking phase...talk to Rob@VMS, he's already hinted that he can re-build the 5 cylinder blocks and make them much much stronger
Show me an STOCK LPT block holding 350whp...or please Oh hush...
Edited by lax01, 26 October 2004 - 05:46 PM.
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#19
JHEIII874T5M
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Posted 26 October 2004 - 05:59 PM
just because no one's done it doesn't mean it can't be done 
Joseph H. Essaye III
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#20
lax01
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Posted 26 October 2004 - 06:09 PM
go for it Joe 
I just don't see why I need to be talked down to like that considering I haven't said much in this thread...
I just don't see why I need to be talked down to like that considering I haven't said much in this thread...
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Past: 1995 Volvo 850 Turbo
