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It's a nice build, but agree simply no need for an iron block at that level. A well built alloy will be fine.
But if you're happy with the weight penalty I guess it is extra insurance.
See they're using the GT9 cam too, and even more interesting that the dyno graph both power and torque are increasing right the way to 6500rpm when they seem to have stopped.
Would be interesting to see how much higher they could carry it.
Very good all round though
But if you're happy with the weight penalty I guess it is extra insurance.
See they're using the GT9 cam too, and even more interesting that the dyno graph both power and torque are increasing right the way to 6500rpm when they seem to have stopped.
Would be interesting to see how much higher they could carry it.
Very good all round though
stevieturbo said:
It's a nice build, but agree simply no need for an iron block at that level. A well built alloy will be fine.
But if you're happy with the weight penalty I guess it is extra insurance.
See they're using the GT9 cam too, and even more interesting that the dyno graph both power and torque are increasing right the way to 6500rpm when they seem to have stopped.
Would be interesting to see how much higher they could carry it.
Very good all round though
I'm not running anywhere near that power but my dyno graph says exactly the same with that cam. Flat torque and power all the way to 7k rpm where you'd expect to start tailing off. With more air flow (bigger power adder) I'm sure it would make more power.But if you're happy with the weight penalty I guess it is extra insurance.
See they're using the GT9 cam too, and even more interesting that the dyno graph both power and torque are increasing right the way to 6500rpm when they seem to have stopped.
Would be interesting to see how much higher they could carry it.
Very good all round though
No idea why people go on about the weight penalties of iron blocks. I've had both in my car and didn't notice any difference in handling. The LSX comes with the ability to run 6 bolt heads, is stiffer and cheaper than the LS7. Given you can buy a B15 crate engine for so little and run it out of the box at 1000 HP with a pair of turbos, I think it's a great way to go.
I dont need 6 bolt heads, I dont need a heavier engine and I dont need an LS7 block.
LS2 is working fine, but the LSA/9 with oil squirters from factory is prob best compromise
If I bought a 6 bolt block, I'd have to buy 6 bolt heads, I'd have to buy new intake etc etc
If pushing for 12, 13, 14, 1500hp then yes those absolutely would be the way to go
And yes if starting from scratch the B15 isnt bad at all, not sure I'd be trusting it beyond 1000hp though without some better parts.
That said, the way people push the 4.8's and 5.3's with OEM parts...does make you wonder sometimes lol
My car will never be a super handing machine, and F/R balance isnt actually that bad, but I just cant see any reason to add another 40-50kgs up front for no huge gains.
Even a bare alloy block is no lightweight. I dont see myself moving away from alloy for a long time yet.
LS2 is working fine, but the LSA/9 with oil squirters from factory is prob best compromise
If I bought a 6 bolt block, I'd have to buy 6 bolt heads, I'd have to buy new intake etc etc
If pushing for 12, 13, 14, 1500hp then yes those absolutely would be the way to go
And yes if starting from scratch the B15 isnt bad at all, not sure I'd be trusting it beyond 1000hp though without some better parts.
That said, the way people push the 4.8's and 5.3's with OEM parts...does make you wonder sometimes lol
My car will never be a super handing machine, and F/R balance isnt actually that bad, but I just cant see any reason to add another 40-50kgs up front for no huge gains.
Even a bare alloy block is no lightweight. I dont see myself moving away from alloy for a long time yet.
Not suggesting you would and I wouldn't bin my LSA either. However, if I was starting again or trying to build something that would say 220mph in a mile, this could be a solid platform to throw boost at. Arnie is running more power and throws more abuse at his engine than any of us and he's in the rare position to not blown it up.
Jez, not suggesting you are going the wrong route, just fantasizing what I myself might build.
Jez, not suggesting you are going the wrong route, just fantasizing what I myself might build.
Didn't think you were mate.
Whilst the LS7 is a flawed starting point it's sufficient for what I require from this build and I already have the majority of the engine it's a low cost option.
My main concern with the LSX block is cooling, as iron is a much poorer conductor of heat than aluminium, I'm sure it's ok for drag applications but I'm unsure how it would perform over the mile, or (as this build is development for my dream to run at Bonneville) longer.
However, I'm not entirely sure of my facts tbh.
Yet
Whilst the LS7 is a flawed starting point it's sufficient for what I require from this build and I already have the majority of the engine it's a low cost option.
My main concern with the LSX block is cooling, as iron is a much poorer conductor of heat than aluminium, I'm sure it's ok for drag applications but I'm unsure how it would perform over the mile, or (as this build is development for my dream to run at Bonneville) longer.
However, I'm not entirely sure of my facts tbh.
Yet
wormus said:
John Sleath exceeded this with Arnies engine , hes your man in this country Xpuffin said:
Didn't think you were mate.
Whilst the LS7 is a flawed starting point it's sufficient for what I require from this build and I already have the majority of the engine it's a low cost option.
My main concern with the LSX block is cooling, as iron is a much poorer conductor of heat than aluminium, I'm sure it's ok for drag applications but I'm unsure how it would perform over the mile, or (as this build is development for my dream to run at Bonneville) longer.
However, I'm not entirely sure of my facts tbh.
Yet
I'd love to see a Monaro running at Bonneville! Would certainly be an epic stop off during a few weeks driving around the USA Whilst the LS7 is a flawed starting point it's sufficient for what I require from this build and I already have the majority of the engine it's a low cost option.
My main concern with the LSX block is cooling, as iron is a much poorer conductor of heat than aluminium, I'm sure it's ok for drag applications but I'm unsure how it would perform over the mile, or (as this build is development for my dream to run at Bonneville) longer.
However, I'm not entirely sure of my facts tbh.
Yet
gsd2000 said:
Stevie how much power are you now making with the twins?
Havent the faintest idea. But over the 1km, last year despite the problems was my best result yet. So presumably it has more power than before, although dont know how much it had before either.I havent really pushed that hard with it yet as last year was just making sure everything was going to hang together with the actual install, especially my dodgy welding on the truck manifolds which surprisingly it has. But then I had the gear selection problems which mucked me up.
In the back of my mind though...I'd say it will be a struggle for 5th gear to survive when I do start pushing it, as mines still the very old 2 piece laygear shaft setup.
Either way, 200mph in 1km is the goal. So whatever power that might take, I'll try and make lol
Xpuffin said:
My main concern with the LSX block is cooling, as iron is a much poorer conductor of heat than aluminium, I'm sure it's ok for drag applications but I'm unsure how it would perform over the mile, or (as this build is development for my dream to run at Bonneville) longer.
The Speed Demon Streamliner happy runs to over 460mph with a Dart Little M (iron) small block chevy engine on the salt flats, so I wouldn't worry too much about choice of materials. Plenty of iron blocks running flat out for several miles going back through the history of the LSR too.ArnieVXR said:
Where can you do 1km events?
Part of TOTB is a standing 1km.Although Straightliners run a few standing miles at venues throughout the year.
There's f
k all over here in Northern Ireland, and even less down south.There are occasional drag events at an old disused airfield...and usually it rains lol
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