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on the road...
https://www.miataturbo.net/attachmen...ine=1419639522 various steps of spark table "improvement" http://i1379.photobucket.com/albums/...psef865b9c.jpg I know the numbers aren't real, but there's a huge difference between logs! inb4 same road, same condition, same boost: 11 psi |
Glue.
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Originally Posted by sixshooter
(Post 1192047)
Glue.
However, with a cool head, I decided to go with 8.8's I think it's not overbuilding, just reliability especially because I'm obviously not a good tuner :party: |
Oh snap.
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Damn, that's the second one that goes up in smoke....interesting build
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Spark table doesn't seem all that aggressive from what others have posted. Why do we think so much detonation?
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where you runnung LPG when it went bang? LPG is far more prone to knock...
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Originally Posted by tjeerd
(Post 1192103)
where you runnung LPG when it went bang? LPG is far more prone to knock...
I was running gasoline btw... |
the octane number is higher but the temperatures are way higher, I wouldnt add timing when burning LPG, I would pull...
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Originally Posted by DNMakinson
(Post 1192101)
Spark table doesn't seem all that aggressive from what others have posted. Why do we think so much detonation?
lol To be completely honest, I'm impressed it lasted this long :) |
I would worry about the base timing being slightly off if I was using an aggressive timing map. Not much room for error.
Is the lpg octane RON or MON or the average? |
Originally Posted by tjeerd
(Post 1192114)
the octane number is higher but the temperatures are way higher, I wouldnt add timing when burning LPG, I would pull...
When I run lpg on boost afr's are high 10's and only with ebc off (140 kPa or 5.8 psi) in fact when I log egt's I can see that are the same as running gasoline, but with 12.5 afr the downside is less power everywhere There are two ways to run lpg allofit (and use the 110 octane benefit): water/meth injection 50-50 liquid injection lpg (like vialle or icom): in this way the lpg enters in the manifold in liquid state, and his phase transition (at atmospheric pressure is a gas) absorbes heat from the sistem very quickly. The main difference between liquid lpg injection and gasoline is that the excees of gasoline remains liquid during the combustion and becomes gas (substracting heat) only when temperature rise enough, preserving the Al of the head and piston from melting When I have the car back on the road and tuned, I wanna try this system. If I broke another engine, it means that w/i is a better choice. If it will survive, well, we discover a new, greener and cheaper than e85 method to run allofit:party: because all this is a game for me, it's only a car! |
Originally Posted by 18psi
(Post 1192124)
That's just 1 piece of the puzzle and even then that's not a conservative map. Also looks like he was near the limit. Also he was clearly knocking. Also he was clearly having issues.
lol To be completely honest, I'm impressed it lasted this long :) I'm not sure if it was really knock or background noises.. when I (voluntarily) caused knock at 4500 rpm (160 kpa) the knock in log was exactly the same, with no peaks, but the ecu pulled istantly two degrees of timing, and the "knock" light turned on this was pretty strange... but with 26 degrees of spark advance at 160 kPa I'm sure the oil escaped from the bearing causing a direct-hit :fael:
Originally Posted by sixshooter
(Post 1192125)
I would worry about the base timing being slightly off if I was using an aggressive timing map. Not much room for error.
Is the lpg octane RON or MON or the average? the mon/ron of standard propane selled in usa is 90-110, but is 90%+ pure what I use is 97%+. customs laboratory checks ordinarily ron levels, and is usually 105-108 |
well in that case you likely simply exceeded the torque limit of the oem noodle rods
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So when is the new motor going in...?
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Originally Posted by DNA54
(Post 1192131)
Got it
When I run lpg on boost afr's are high 10's and only with ebc off (140 kPa or 5.8 psi) in fact when I log egt's I can see that are the same as running gasoline, but with 12.5 afr the downside is less power everywhere There are two ways to run lpg allofit (and use the 110 octane benefit): water/meth injection 50-50 liquid injection lpg (like vialle or icom): in this way the lpg enters in the manifold in liquid state, and his phase transition (at atmospheric pressure is a gas) absorbes heat from the sistem very quickly. The main difference between liquid lpg injection and gasoline is that the excees of gasoline remains liquid during the combustion and becomes gas (substracting heat) only when temperature rise enough, preserving the Al of the head and piston from melting When I have the car back on the road and tuned, I wanna try this system. If I broke another engine, it means that w/i is a better choice. If it will survive, well, we discover a new, greener and cheaper than e85 method to run allofit:party: because all this is a game for me, it's only a car! |
Originally Posted by ScottyP3821
(Post 1192141)
So when is the new motor going in...?
tomorrow I will know if the head survived ( I hope so...), and on monday I will go to the machine shop with the spare block to see if it is usable with 84mm pistons. If yes and yes, I can build the engine in one-two mounths if not and yes two-three mounths and so on money :vash: |
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ok, little update:
the spare block is usable with oversized +1mm supertech pistons. The head is gone. spare block going at the machine shop https://www.miataturbo.net/attachmen...ine=1419929834 driver side window https://www.miataturbo.net/attachmen...ine=1419929834 passenger side window https://www.miataturbo.net/attachmen...ine=1419929834 I found half of the piston with rings on it in the cylinder, but without the rod lol https://www.miataturbo.net/attachmen...ine=1419929834 https://www.miataturbo.net/attachmen...ine=1419929834 https://www.miataturbo.net/attachmen...ine=1419929834 https://www.miataturbo.net/attachmen...ine=1419929834 https://www.miataturbo.net/attachmen...ine=1419929834 https://www.miataturbo.net/attachmen...ine=1419929834 my neighbour's cats this morning: https://www.miataturbo.net/attachmen...ine=1419929834 |
Your neighbor has a bouquet of cats as the centerpiece for his table.
That's a classic rod failure but I think the block will be fine. A little JB Weld and some gentle honing should make it like new. |
:laugh:
now that is some proper carnage |
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