Engine exploding

[loganbar10]

after I drive the car for a while, if it stalls or I turn it off, then turn it back on and heavly accelerate, the 1st and 2nd main bearings pop out then the first 3 pistons break. Can i get some advice please. Thanks in advance.

[Evan]

1. How long ago did you build the car? And have you replaced any parts?
2. Are these pistons braking through the block/oilpan? Or are they just falling down?
3. Did you completely tighten the bearings/crankshaft/pistons?
4. How hard are you accelerating? If you go from Neutral, to 1st, to 2nd, and at max rpm on 2nd, downshift, you will blow pistons. Ask me how I know.

https://steamcommunity.com/sharedfiles/filedetails/?id=2053798294
Holes in block.

Show us a picture of your pistons when they fall out.

[loganbar10]

Originally posted by Evan:

1. How long ago did you build the car? And have you replaced any parts?
2. Are these pistons braking through the block/oilpan? Or are they just falling down?
3. Did you completely tighten the bearings/crankshaft/pistons?
4. How hard are you accelerating? If you go from Neutral, to 1st, to 2nd, and at max rpm on 2nd, downshift, you will blow pistons. Ask me how I know.

https://steamcommunity.com/sharedfiles/filedetails/?id=2053798294
Holes in block.

Show us a picture of your pistons when they fall out.

i had built the car very recently, maybe a month or so ago, i have done constant oil changes and have made sure all the parts are 100% fixed in msceditor. all the bolts where tightened in game by me, plus i had double checked in msc editor. when I will accelerate, i will punch the gas as hard as a can because sometimes the engine would bog out and stall (found out its because i was accelerating while the wheel is turned all the way to a direction or not pressing it hard enough), i would do this in neutral. there was no holes in the block that i could find.

https://steamcommunity.com/sharedfiles/filedetails/?id=2137967936

it seems to be somewhat random, but that's what i had at most

[camaroz28995]

what is your air/fuel ratio
what is your engine timing at

[loganbar10]

Originally posted by camaroz28995:

what is your air/fuel ratio
what is your engine timing at

the timing is perfectly fine. my A/F ratio is aprox. 15.5

[Rick]

15.5 is way to lean. Have you checked cam timing AND ignition timing?

What's the rpm when the drive away? Do you have the light flywheel on?

[loganbar10]

I do have the light flywheel on. My cam timing is set properly, and my ignition timing isn't chirping and is approximately in the middle. And if your talking about the rpms while in the drive way, when about 10,000rpm
Edit:1000rpm

[Evan]

Originally posted by Loganbar10:

I do have the light flywheel on. My cam timing is set properly, and my ignition timing isn't chirping and is approximately in the middle. And if your talking about the rpms while in the drive way, when about 10,000rpm

You're going 10,000 RPM? You should not be at 10,000 ever. The engine can't really go past 8500 (ish) without anything breaking. I shift up at approx 6000-7000 (I go off sound now, I haven't had tach on for a while). For best performance shift at approx 7000 rpm. And do NOT ever downshift if you are above 5500 rpm. Also don't rev too high in neutral. If you're trying to warm up, use the choke. You're running a little lean, might want to pull choke for a little bit until you're up to temp. Don't leave the choke on forever, you might overheat & catch on fire.

[loganbar10]

Originally posted by Evan:

Originally posted by Loganbar10:

I do have the light flywheel on. My cam timing is set properly, and my ignition timing isn't chirping and is approximately in the middle. And if your talking about the rpms while in the drive way, when about 10,000rpm

You're going 10,000 RPM? You should not be at 10,000 ever. The engine can't really go past 8500 (ish) without anything breaking. I shift up at approx 6000-7000 (I go off sound now, I haven't had tach on for a while). For best performance shift at approx 7000 rpm. And do NOT ever downshift if you are above 5500 rpm. Also don't rev too high in neutral. If you're trying to warm up, use the choke. You're running a little lean, might want to pull choke for a little bit until you're up to temp. Don't leave the choke on forever, you might overheat & catch on fire.

Sorry, i am stupid. I ment 1000rpm.

[camaroz28995]

if the car is full warmed up and your running 15.5 and your running the car hard the engine wint last long. Try 13.2-13.6 fully warmed up. Thats what i run. I bet on the car hard and never had an issue,

[loganbar10]

Originally posted by camaroz28995:

if the car is full warmed up and your running 15.5 and your running the car hard the engine wint last long. Try 13.2-13.6 fully warmed up. Thats what i run. I bet on the car hard and never had an issue,

Doesn't 13.2 - 13.6 seem a bit rich though, I though the perfect ratio was a flat 15, because on the af gauge thats in the middle of the green, which I thought ment it was perfect? Also if or when I adjust it, should I do it through MSCEditor or manually

[Evan]

15.5 is a bit lean. The "perfect" A/F ratio is around 14.7 but approx 13 is better for performance. I have heard that 12.2 (ish) is best for performance, but I haven't tested it myself.

Try pulling the choke until you get to med. temp, tune your carb a little rich (use google for that, it's not very hard to tune it, you can do it). Once you do that, try driving forward. If you can send a video of it or give description on what happens.

[loganbar10]

Originally posted by Evan:

15.5 is a bit lean. The "perfect" A/F ratio is around 14.7 but approx 13 is better for performance. I have heard that 12.2 (ish) is best for performance, but I haven't tested it myself.

Try pulling the choke until you get to med. temp, tune your carb a little rich (use google for that, it's not very hard to tune it, you can do it). Once you do that, try driving forward. If you can send a video of it or give description on what happens.

nothings wrong with driving, it is when i start it and punch the gas in neutral just after i start it.

[loganbar10]

Originally posted by Loganbar10:

Originally posted by Evan:

15.5 is a bit lean. The "perfect" A/F ratio is around 14.7 but approx 13 is better for performance. I have heard that 12.2 (ish) is best for performance, but I haven't tested it myself.

Try pulling the choke until you get to med. temp, tune your carb a little rich (use google for that, it's not very hard to tune it, you can do it). Once you do that, try driving forward. If you can send a video of it or give description on what happens.

nothings wrong with driving, it is when i start it and punch the gas in neutral just after i start it.

just went into msceditor to adjust the timing and check for other issues, and found out after i was told by Rick to make sure my ignition timing was set properly, i had way off set it, down to 10.4 instead of around 14