Sävar Turbo Site

Ett forum för motorentusiaster
Aktuellt datum och tid: sön jul 22, 2018 6:09 am

Alla tidsangivelser är UTC + 1 timme




Ny tråd Svara på tråd  [ 5 inlägg ] 
Författare Meddelande
InläggPostat: tis maj 17, 2016 2:46 pm 
Offline
Lite mer laddtryck

Blev medlem: fre jan 09, 2009 7:07 pm
Inlägg: 45
Ort: USA, Alabama
First, the engine setup:
E-85
2.5L 16v FS324 cams HX-52, nitrous(why not), ~9:1 compression ratio (or possibly lower). 96.5mm bore size.
block is 1995 b230f

Running about 35psi when it broke, Ethanol percentage has been steady at 75% for the past tank and a half of fuel, about 17 degrees of ignition timing up top(crept up to that via tuning at the track). ~.78 lambda. Max rpm's 8100. Stock valve size, but ported head. (not that that matters for this)
Car traps 133mph off the spray, and 142mph on the spray
Block was pinned.

When it likely cracked: 34psi, 17degrees, and ~.95 lambda. I think injector, because only #3 showed any signs of trouble. 1,2,4 all looked good, plugs looked good when the head came off.

I had an issue (suspect faulty injector) sunday at the race that resulted in problems with the #3 cylinder, with it finally cracking up to the deck (don't know how far down the crack goes, haven't gotten the block out of the car). In reading other threads here on Savar, I've noticed two things:

96.5mm bore size may be "too big" for the power level I'm at and the power levels I'm hoping to get to, and

Pistons did not have a 'full skirt'

Bild

So, my question is this: Is it better to sleeve a block, perhaps to a slightly smaller bore size (say, 94 or 95mm) and retain the cooling system and perhaps run a little tighter piston to wall clearance, OR

fill the block with hard-blok and run whatever pistons fit with minimal machine work to the bores? I've seen talk of 2-3cm from the top, with tubes for coolant, but I'm having a hard time picturing this. Are there any photos of this process?

Is there anything else I need to consider/do with the block? It may eventually get to 900-1000hp, but I'm in no rush to see those numbers yet.

The engine went out on a high note, I outran an F1x procharged 2015 viper at a roll race event 8)
https://youtu.be/1tuFK_EGNGc

only have a few pictures right now, perhaps something else jumps out.
Bild

Bild

(and yes, no roll cage. that's also on the summer project list along with switching to a wagon chassis)

_________________
1990 740 gl
2003 Evo 8


Upp
 Profil  
 
InläggPostat: tis maj 17, 2016 9:18 pm 
Offline
Forumsberoende
Användarvisningsbild

Blev medlem: mån sep 19, 2011 1:48 pm
Inlägg: 827
Ort: Nordmaling
Sorry, can't help you with your engine questions but your Volvo does sound good!! :thumbright:

_________________
Martin, Mopar 512 cui, E85, MegaSquirt MS3X fully sequential ign. & inj.


Upp
 Profil  
 
InläggPostat: ons maj 18, 2016 5:55 am 
Offline
Forumsberoende

Blev medlem: fre dec 23, 2005 10:49 pm
Inlägg: 9065
Ort: Patrick Wetterskog Ludvika tel:0707928582
Many guys in Sweden have cracked their blocks using non fullskirt pistons.
I´m not a very very good volvotuner, but there´s a lot to read about that on this board.

_________________
///AMG
Älskar att få kärleksbrev, tyvärr är jag upptagen så ni får vänta..... :D


Upp
 Profil  
 
InläggPostat: ons maj 18, 2016 6:34 pm 
Offline
Lite mer laddtryck

Blev medlem: fre jan 09, 2009 7:07 pm
Inlägg: 45
Ort: USA, Alabama
Yeah I've been reading about that. The pistons I get for the next block will be full skirt

_________________
1990 740 gl
2003 Evo 8


Upp
 Profil  
 
InläggPostat: ons jun 22, 2016 9:04 pm 
Offline
För mycket laddtryck

Blev medlem: sön aug 27, 2006 6:17 pm
Inlägg: 284
Ort: Denmark
We have cracked 2 blocks with oem volvo pistons also. Stock bore.

It stopped completely once we started using concrete fill in the block.
As tall as 35mm below deck has been tried, without runniing into cooling problems.


Upp
 Profil  
 
Visa inlägg nyare än:  Sortera efter  
Ny tråd Svara på tråd  [ 5 inlägg ] 

Alla tidsangivelser är UTC + 1 timme


Vilka är online

Användare som besöker denna kategori: Inga registrerade användare och 5 gäster


Du kan inte skapa nya trådar i denna kategori
Du kan inte svara på trådar i denna kategori
Du kan inte redigera dina inlägg i denna kategori
Du kan inte ta bort dina inlägg i denna kategori

Sök efter:
Hoppa till:  
POWERED_BY
Swedish translation by Peetra & phpBB Sweden © 2006-2010