Hej alla, jag är Miguel från Mallorca och jag har två Volvo, en 240 med en B230ET SWAP och en 960 som jag håller på att trimma, jag ska berätta om projektet.

Jag sätter ett block av en S80 B6294T (272hp) med cylinderhuvudet på min 960 atmospheric, eftersom jag inte vill sätta en annan ECU (jag har ett FEKZEN-chip som hjälper mig att hantera turbon etc).

Jag har flera frågor, en av dem handlar om kompressionsförhållandet, jag vill sänka det till 8,5 och på 960:an är det 10,7.

Problemet är att jag har tittat och mer eller mindre måste jag ta bort ungefär 8,1cc från cylinderhuvudet eller kolven... och jag undrar om någon kan hjälpa mig med råd om detta.

Jag kommer att installera en turbo, injektorer osv. osv. osv. tills jag kan nå 400 hk. Jag vill om möjligt inte röra kolvar eller kopplingsstänger.

Och vad är bättre än ett svenskt forum eftersom ni är mästare på Volvos!

Tack så mycket på förhand och tack till google översättare hahaha

but it you use a t6 block you dont need change stuff.  its like you going with 6 piston from a b5234t (850turbo) engine.   

you can use your stock head from your 960 with out no problem   piston in t6 block lowering your comp head is like same shit..    so your stock head on your b6294t block and you can boost it without problem..    but you going to push your rod with 400hp

Growe skrev:

but it you use a t6 block you dont need change stuff.  its like you going with 6 piston from a b5234t (850turbo) engine.   

you can use your stock head from your 960 with out no problem   piston in t6 block lowering your comp head is like same shit..    so your stock head on your b6294t block and you can boost it without problem..    but you going to push your rod with 400hp

hi, i want equalize the CR to push up the boost. (becouse if i conserve the 960 cam, i could only push it to 0,5 aprox...)

I believe the 850 pistons are 81mm and i have 83mm


Does it make sense? thanks a lot

BOLBO skrev:

Growe skrev:

but it you use a t6 block you dont need change stuff.  its like you going with 6 piston from a b5234t (850turbo) engine.   

you can use your stock head from your 960 with out no problem   piston in t6 block lowering your comp head is like same shit..    so your stock head on your b6294t block and you can boost it without problem..    but you going to push your rod with 400hp

hi, i want equalize the CR to push up the boost. (becouse if i conserve the 960 cam, i could only push it to 0,5 aprox...)

I believe the 850 pistons are 81mm and i have 83mm


Does it make sense? thanks a lot

your cam and head dont set your boost level     it can be a small differnse in your stock head and your new head but its not head and cam that set your compression its your piston..  so with stock b6294t piston you can boost more than 0.5 thats are near stock boost in a 272hp engine. 

and b6294t head is a vvt head right..  you can lock vvt and go  with that head or use your 960 stock head.   you can go over 0.5 if you have fuel for it. 
a t5 engine like b5234t  with 225hp stock going over 300 with 1.2bar boost with a 16t turbo.   after that your bend your rods..  and i dont think a t6 is a lot stronger byt one cyl more to but less load on your rods.   

but its a volvo engine so dont overthink it..    put it together and try..          but your rods going to be your weakest part .

with stock b6294t block your going to be at 8.5:1   +- what differns in your head but thats not a big difference..  it even can get lower than a stock b6294t head..  but i think it same casting  with smaler difference at camshaft side.   like vvt and that shit.  volvo dont fuck things upp they use same stuff as long as they can..    so if you use a 6cyl(2.5l)81mm block with 3l 90mm   crank  you can use 6 piston and rods from a t5 b5234t engine and you get that lower compression. 

thats a common way to do it in sweden.

Growe skrev:

BOLBO skrev:

Growe skrev:

but it you use a t6 block you dont need change stuff.  its like you going with 6 piston from a b5234t (850turbo) engine.   

you can use your stock head from your 960 with out no problem   piston in t6 block lowering your comp head is like same shit..    so your stock head on your b6294t block and you can boost it without problem..    but you going to push your rod with 400hp

hi, i want equalize the CR to push up the boost. (becouse if i conserve the 960 cam, i could only push it to 0,5 aprox...)

I believe the 850 pistons are 81mm and i have 83mm


Does it make sense? thanks a lot

your cam and head dont set your boost level     it can be a small differnse in your stock head and your new head but its not head and cam that set your compression its your piston..  so with stock b6294t piston you can boost more than 0.5 thats are near stock boost in a 272hp engine. 

and b6294t head is a vvt head right..  you can lock vvt and go  with that head or use your 960 stock head.   you can go over 0.5 if you have fuel for it. 
a t5 engine like b5234t  with 225hp stock going over 300 with 1.2bar boost with a 16t turbo.   after that your bend your rods..  and i dont think a t6 is a lot stronger byt one cyl more to but less load on your rods.   

but its a volvo engine so dont overthink it..    put it together and try..          but your rods going to be your weakest part .

with stock b6294t block your going to be at 8.5:1   +- what differns in your head but thats not a big difference..  it even can get lower than a stock b6294t head..  but i think it same casting  with smaler difference at camshaft side.   like vvt and that shit.  volvo dont fuck things upp they use same stuff as long as they can..    so if you use a 6cyl(2.5l)81mm block with 3l 90mm   crank  you can use 6 piston and rods from a t5 b5234t engine and you get that lower compression. 

thats a common way to do it in sweden.

Hello! thank you for replying and for your help.

Maybe with the translator I'm not understanding but I'll tell you my doubts about the RC.

I have cubed the two cylinder heads, not perfectly, but approximately, and the compression ratio fits me. The 960 has 42cc (I don't know the cubic capacity of the piston head of the 960, but it is positive).

On the other hand we have the one from the S80 which gives 50cc + 12 of the piston head, total 62cc approx.

By that rule of three if I put the cylinder of the B6294T and the head of the 960 I get a CR of 10.1 approx.

So, what seemed to me, is that it is a very high CR to boost, isn't it? I know that there are cars like the sierra cosworth that go to 11.0, but of course... I don't know how long the engine will last.

Can you explain to me why the fuel determines the boost? I've looked for it but I can't find an answer that I can understand.

I'll tell you the configuration I'm going to use:

Garret GT3071 or GT2860R turbo.
Bosch green 465cc injectors
Intercooler (I haven't decided which one yet)
Fuel pressure regulator
Bosch 044 pump
960 Turbo chip (Fekzen)

I thought I could get to 350/400hp, keeping the original pistons and rods and praying before putting the pedal to the metal hahaha...

thanks a lot