Twin turbo ly6/lq9 build
05-27-2017, 09:42 PM
#1
Teching In
Thread Starter
Twin turbo ly6/lq9 build Hi guys,
Couple of questions regarding a new motor im piecing together.
Im contemplating building a 408 twin turbo setup for a utility of mine and im unsure if i should use the lq9/lq4 or spend the extra 2/300 and get a ly6. Im leaning towards the ly6 due to the l92 heads. Would anyone dissagree here?
Now. if i was to stay 6lt how would the ly6 hold up against 18-20psi in standard form? As i aiming for 1000hp so i get around 750 to the tyre i honestly think im better off just spending the money and stepping up to the 408 to make life a little less stressful lol
So my plan at this stage (either 408ci or 364ci) is to 1/2in stud the block to help hold the heads down but i was also looking into orings? I understand what it is but if i do this to the block then what dose this change in regards to head gasket usage ect.
Also whats the average cylinder wall thickness with these blocks at 4.030. Would i be better off staying at say 4.005 to help the walls integrity or are they still plentiful at 4.030.
Cheers guys
Cars a 2002 Holden VY SS Ute ill start a build thread once its underway at the moment im just trial fitting the manifolds and turbos to the ls1 so i can tig up all my pipe work
Hope everyones having a good week
Cheers
Thebutcher...
Couple of questions regarding a new motor im piecing together.
Im contemplating building a 408 twin turbo setup for a utility of mine and im unsure if i should use the lq9/lq4 or spend the extra 2/300 and get a ly6. Im leaning towards the ly6 due to the l92 heads. Would anyone dissagree here?
Now. if i was to stay 6lt how would the ly6 hold up against 18-20psi in standard form? As i aiming for 1000hp so i get around 750 to the tyre i honestly think im better off just spending the money and stepping up to the 408 to make life a little less stressful lol
So my plan at this stage (either 408ci or 364ci) is to 1/2in stud the block to help hold the heads down but i was also looking into orings? I understand what it is but if i do this to the block then what dose this change in regards to head gasket usage ect.
Also whats the average cylinder wall thickness with these blocks at 4.030. Would i be better off staying at say 4.005 to help the walls integrity or are they still plentiful at 4.030.
Cheers guys
Cars a 2002 Holden VY SS Ute ill start a build thread once its underway at the moment im just trial fitting the manifolds and turbos to the ls1 so i can tig up all my pipe work
Hope everyones having a good week
Cheers
Thebutcher...
05-27-2017, 10:37 PM
#3
Teching In
Thread Starter
My_2k_z Please explain why?
I understand the 370 has less stroke and wont put as much stress on the sidewalls and rev faster n higher. But is there any other reason to stay short stroke rather than 408
For the price of good components these days a 4in crank stroker kit is only marginaly more expensive than the 3.6in
I understand the 370 has less stroke and wont put as much stress on the sidewalls and rev faster n higher. But is there any other reason to stay short stroke rather than 408
For the price of good components these days a 4in crank stroker kit is only marginaly more expensive than the 3.6in
05-28-2017, 05:58 PM
#5
9 Second Club
Stay standard bore size, and standard stroke. Unless you absolutely need the extra low rpm torque from the stroker.
You could probably do the larger bore ok...but why not leave that for the future in case you do run into issues ? If you bore the block to its limit now, any problems later might mean a new block.
As for holding up to 1k in standard form.....crank probably ok...rods/pistons probably not.
Forge the rotating parts, 1/2 studs a good call. Get some goods heads and the right turbos etc etc and job done.
You could probably do the larger bore ok...but why not leave that for the future in case you do run into issues ? If you bore the block to its limit now, any problems later might mean a new block.
As for holding up to 1k in standard form.....crank probably ok...rods/pistons probably not.
Forge the rotating parts, 1/2 studs a good call. Get some goods heads and the right turbos etc etc and job done.