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| Home > Help Needed / General Tech Chat > FFS - the head gasket is blown AGAIN!!! | |||||||
 248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 07:54:21pm
Right - I'm getting really pissed off and getting to the end of my tether with this FI lark.
"se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
25th Mar, 2010 at 08:03:27pm
head pocketed? On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 08:10:23pm
Sorry - combustion chamber enlarged....... "se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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 4641 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
25th Mar, 2010 at 08:29:30pm
You need to remove the amount of material required to give you the compression ratio you desire. |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
25th Mar, 2010 at 08:33:05pm
are you torqeing the headto 55 ft pounds ?
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248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 08:35:42pm
On 25th Mar, 2010 Turbo Phil said:
You need to remove the amount of material required to give you the compression ratio you desire. kk - how do I work this out? The Standard CC for a 1275 head is about 21cc (ish) is this still the same for the MPI? Edited by MrOz on 25th Mar, 2010. "se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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4641 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
25th Mar, 2010 at 08:45:05pm
21.4cc is "standard" but they can vary quite a bit. On another note, the gaskets don't usually blow for no reason. As Benross said you could be getting detonation which is taking the gasket out, incorrect head torque, poor or old studs/nuts, head warped etc Edited by Turbo Phil on 25th Mar, 2010. |
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3596 Posts Member #: 655 Post Whore Northern Ireland |
25th Mar, 2010 at 09:27:15pm
BK450 and AF470 are basically the same.
9.85 @ 145mph
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 869 Posts Member #: 2443 Post Whore Cheshire |
25th Mar, 2010 at 09:37:42pm
Is this an M45 supercharger set up? If so check the charge temps and boost pressure, you will probably find temps are sky high and boost is higher than expected also......ala detonation |
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248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 10:08:08pm
On 25th Mar, 2010 BENROSS said:
are you torqeing the headto 55 ft pounds ? are you sure! that the engines not running into detonation ...ie mixture not right .. too lean and or ignition timing too advanced for the fuel you are running whats the CR you running and the boost your running ? have you an intercooler ? whats the engine short spec ? Yeah, the last time I replaced that head gasket - torqued to 55ft/lb. According to Stuart Gurr the CR is 8.5:1, not using an intercooler - Vmax Chargecooler system. Short engine specs are MPI standard. On 25th Mar, 2010 Turbo Phil said:
21.4cc is "standard" but they can vary quite a bit. On another note, the gaskets don't usually blow for no reason. As Benross said you could be getting detonation which is taking the gasket out, incorrect head torque, poor or old studs/nuts, head warped etc I'll need to investigate the dentonation question On 25th Mar, 2010 stevieturbo said:
BK450 and AF470 are basically the same. The fact you are even suggesting opening the chamber up to try and stop head gaskets blowing...leads me to suggest you take the car to someone who knows what they are doing. If I can work out the amount of materal to be removed from the head, I'll be able to get the techs at my old college to do me a favour (hopefully) if not there are a couple of good engineering firms in my area that should be able to do it. On 25th Mar, 2010 Andy500 said:
Is this an M45 supercharger set up? If so check the charge temps and boost pressure, you will probably find temps are sky high and boost is higher than expected also......ala detonation Yeah, it's the Vmax MPI150 kit - the boost gauge was reading 0.8 bar - not sure about the temps - I'll check this soon as possible. And thanx once again for the great info/help. "se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
25th Mar, 2010 at 10:12:23pm
Assuming that the engine is a standard MPi engine and the head is a standard chamber, you are running a decompression plate? On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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869 Posts Member #: 2443 Post Whore Cheshire |
25th Mar, 2010 at 10:32:05pm
My money is on detonation. I bet your seeing charge temps in excess of 90 degrees C! |
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248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 10:50:23pm
On 25th Mar, 2010 Sprocket said:
Assuming that the engine is a standard MPi engine and the head is a standard chamber, you are running a decompression plate? Yeah, again accoring to Stuart Gurr - two head gaskets and the decompression plate add 12cc. On 25th Mar, 2010 Andy500 said:
My money is on detonation. I bet your seeing charge temps in excess of 90 degrees C! I'll check that once I've got the Mini up and running again. I'm gonna be using the decompression plate again - until I have enough money to sort things properly. "se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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 116 Posts Member #: 4273 Advanced Member stoke on trent |
25th Mar, 2010 at 11:24:06pm
mate of mine had got a vmaxscart supercharger and head and he call my house lsat night car running like bag of shit we did a compresion test and nothing on 2 and 3 so head gastek has gone this is the second time its happend in 6mth
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248 Posts Member #: 5007 Senior Member Crazyhill, Livi |
25th Mar, 2010 at 11:44:52pm
On 25th Mar, 2010 nibble36 said:
mate of mine had got a vmaxscart supercharger and head and he call my house lsat night car running like bag of shit we did a compresion test and nothing on 2 and 3 so head gastek has gone this is the second time its happend in 6mth he useing 2 head gastkets and a decompresion plate... hes not happy chat going look at the head when he gets it off se what cc it is and go from there good luck with yours mate Cheers fella - like wise with your mates. "se ne estas rompita, ne ripar ĝi - supercharge ĝi." |
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3596 Posts Member #: 655 Post Whore Northern Ireland |
25th Mar, 2010 at 11:58:21pm
Why not just have the thing tuned properly ?
9.85 @ 145mph
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
26th Mar, 2010 at 07:58:52am
Have you had the block refaced? I just decked a block and it needed 4/10mm to become straight. They sink between number 1 and 4 it seems. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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869 Posts Member #: 2443 Post Whore Cheshire |
26th Mar, 2010 at 08:45:52am
MrOz
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 9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
26th Mar, 2010 at 08:50:57am
On 26th Mar, 2010 Vegard said:
They sink between number 1 and 4 it seems. where abouts do you mean exactly Ve? between the cylinders? Yes i moved to the darkside |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
26th Mar, 2010 at 09:02:14am
On 26th Mar, 2010 Brett said:
On 26th Mar, 2010 Vegard said:
They sink between number 1 and 4 it seems. where abouts do you mean exactly Ve? between the cylinders? Yes, that's what I mean. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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 10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
26th Mar, 2010 at 09:31:34am
Hmm. I better check my block before I build it up then If something is worth doing, it's worth doing half of. |
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9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
26th Mar, 2010 at 09:36:33am
On 26th Mar, 2010 John said: mine is definitely going for a skim before i rebuild
Hmm. I better check my block before I build it up then  Yes i moved to the darkside |
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10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
26th Mar, 2010 at 09:39:19am
From what I have read the Accralites I have sit about 0.6mm down the block so I have a bit to play with.
If something is worth doing, it's worth doing half of. |
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 4890 Posts Member #: 1775 Post Whore Chester |
26th Mar, 2010 at 10:20:35am
Doesn't the re-circ valve help with the over-run so you don't stall the car when coming to a stop from boost?
On 26th Mar, 2010 Andy500 said:
MrOz Ive been running the same kit for the past 3 or 4 years. Ive spent a hell of a lot of money and time getting it right and spent a lot of time at Emerald with Dave Walker on the rollers. Not sure if yours is the same but mine ran a recirc of the bottom of the charger to drop the boost. With a standard mpi bottom pulley and standard bini charger pulley the charger created 18psi without the recirc and abut 14 with it! Have you fitted a map sensor. I installed one and stuck the IAT sensor in the inlet manifold..... In the end i had a new supercharger pulley made to drop the boost. It now runs 8psi without the recirc and only lost 2hp over what it produced at 18psi!!!! shows how inefficient the chargers are! Ive only ever taken 1 hg out but fooked a piston crown and pinched a ring when before it was sorted. When it was at 18psi the charge temp hit 110 degrees C!!!!! it was hotter than the coolant in the engine! I run a supercharger and I don't care the TB is on the wrong side.
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869 Posts Member #: 2443 Post Whore Cheshire |
26th Mar, 2010 at 10:26:57am
No the eatons have an internal recirc for this. The recirc that vmax fits is basically a bleed off the outlet of the charger. |
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