madmike wrote:Dave Kadwell did some dyno testing on 94mm pistons & cyl's I'll try and find them results
I think those split at around 36 psi. But I can’t seem to find the whole article on how it was set up. Blow through or draw through and ignition timing.
I remember reading one some where where a guy saw a 45psi spike due to a severed waste gate line then torched a cylinder head. But who knows as his gauge maxed at 45.
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Splitting a cylinder on a wrongly tuned engine, or other malfunctions are not the same as splitting it by it maxing out it's capabilities.
It will take 45psi on a good tune.
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
Bug66 runs E85. Big difference with regard to detonation sensitivity and you can much easier run bigger boost, we sometimes forget.
Most I saw was once on the dyno for 'all out' on my old 2,2 type 4 with the short Oettinger/Mahle alu-nikasil barrels: 30psi at 5-5,2K, then dropping back to 24psi or so (turbo was out of airflow) at max power. That was 465 hp (crank, or about 400 rear wheel) at 6300 or so iirc.
I only run on gasoline (E5) btw
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi www.apfelbeck.nl "Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
Bug66 wrote: ↑Thu Oct 22, 2020 7:49 pm
Splitting a cylinder on a wrongly tuned engine, or other malfunctions are not the same as splitting it by it maxing out it's capabilities.
I soooo agree. 99% of all 'split cylinders' do so because of detonation imho, not because of lack of structural integrity.
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi www.apfelbeck.nl "Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
It's been because of bad vacuum signal (used 1 runner for the fuel regulator..)
It's been because of bad valve springs
It's been because of splitting a silicone coupler
Never because it just could not hold together
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
Wally wrote: ↑Fri Oct 23, 2020 12:28 am
It also has a lot to do with: what fuel is used.
Bug66 runs E85. Big difference with regard to detonation sensitivity and you can much easier run bigger boost, we sometimes forget.
Most I saw was once on the dyno for 'all out' on my old 2,2 type 4 with the short Oettinger/Mahle alu-nikasil barrels: 30psi at 5-5,2K, then dropping back to 24psi or so (turbo was out of airflow) at max power. That was 465 hp (crank, or about 400 rear wheel) at 6300 or so iirc.
I only run on gasoline (E5) btw
Didn't you also run a healthy dose of water/methanol while running that high of boost?
Wally wrote: ↑Fri Oct 23, 2020 12:28 am
It also has a lot to do with: what fuel is used.
Bug66 runs E85. Big difference with regard to detonation sensitivity and you can much easier run bigger boost, we sometimes forget.
Most I saw was once on the dyno for 'all out' on my old 2,2 type 4 with the short Oettinger/Mahle alu-nikasil barrels: 30psi at 5-5,2K, then dropping back to 24psi or so (turbo was out of airflow) at max power. That was 465 hp (crank, or about 400 rear wheel) at 6300 or so iirc.
I only run on gasoline (E5) btw
Didn't you also run a healthy dose of water/methanol while running that high of boost?
Indeed! always have used 50-50 water-meth injection, plus big intercooler, plus knock sensing and control (but its still no match for E85).
All because detonation is a bitch!
Very interesting. I would have thought it would have started to lift the heads at 40 psi or so.
I'm running stock rods so i won't be trying anything nuts myself, but i was really just more curious than anything. Most likely be limiting myself to 25 psi or so with this turbo. I run E85 most of the time too. Small turbo on a 2054 with 1 3/8" header.
buguy wrote: ↑Fri Oct 23, 2020 12:19 pm
Very interesting. I
Small turbo on a 2054 with 1 3/8" header.
My opinion (FWIW) on 'small turbos' is maybe even more interesting: they kill motors more then big turbo's.
Another one: your 25 psi is 'completely' different then my 25psi with my turbo...
How about that?
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi www.apfelbeck.nl "Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
Dave definitely knows his $hit. I could have sworn it was much lower boost than that. Seems like i had that link saved but was no longer there.
Edit: found this post about it. viewtopic.php?f=3&t=102753
The forum discussing said 36 for sure. Detonation and a bent wrist pin. They also where running just some aa 94s and showing how you can push not so high performance parts.