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| Home > Technical Chat > if i can use a t3 turbo on my A+1293 engine safely without change cyclider head? | |||||||
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83 Posts Member #: 6003 Advanced Member |
3rd Jun, 2009 at 05:04:20pm
if i can use a t3 turbo on my A+1293 engine safely without change cyclider head?
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
3rd Jun, 2009 at 05:25:35pm
I can here the Benross typing away.
Own the day
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
3rd Jun, 2009 at 05:44:53pm
It's totally impossible to say. What's the current compression ratio of the engine? Which ignition have you got? 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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 6752 Posts Member #: 828 Post Whore uranus |
3rd Jun, 2009 at 06:12:15pm
is cyclider a bit like clamydia ,but it keeps coming back ? Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
3rd Jun, 2009 at 06:25:51pm
On 3rd Jun, 2009 robert said:
is cyclider a bit like clamydia ,but it keeps coming back ? had that robert in my youth....lol 
in answer to your question in short yes! but............ what pistons have you now got in and the CCs in the crowns ? in short you have to take into account the compression ratio you now have ? depending what maximum boost you wish to run and wether you are running an intercooler or not ? also will the rest of the engine parts (ie) take it clutch, gearbox, drop gears, diff etc.... are they standard ..? more info then we can advise you right! of course a well sorted head is a big improvement to any state of engine tune than a standard one. hope this helps
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83 Posts Member #: 6003 Advanced Member |
3rd Jun, 2009 at 06:32:24pm
i will use a 18cc +20 pistons , i dont know the CR will would be |
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9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
3rd Jun, 2009 at 06:50:46pm
using those pistons gives you a cr of 8.15:1 a shade low, you want to be 8.5:1
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83 Posts Member #: 6003 Advanced Member |
3rd Jun, 2009 at 06:57:14pm
On 3rd Jun, 2009 BENROSS said:
using those pistons gives you a cr of 8.15:1 a shade low, you want to be 8.5:1 this will promote better economy and spool the turbo up a tad quicker at 8.1 you will have no problems running that boost without intercooler 8.15:1 is with standard cylider head or turbo head? so if i boost 10psi, 8.5:1 is better? thanks |
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 1050 Posts Member #: 764 Post Whore Staffordshire |
3rd Jun, 2009 at 07:12:32pm
iirc the chambers are the same on the turbo head as they are on the standard n/a head.. |
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 4633 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
3rd Jun, 2009 at 07:18:54pm
The Turbo head is no different in chamber volume, 21.4cc, the same as all other 940's. |
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83 Posts Member #: 6003 Advanced Member |
3rd Jun, 2009 at 07:28:02pm
this sound like i dont need to change head? |
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4633 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
3rd Jun, 2009 at 07:30:21pm
Changing to another standard 940 casting will achieve no change in compression, as the chamber vols are the same. If you need to lower the compression, have the chambers in your current head enlarged. |
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83 Posts Member #: 6003 Advanced Member |
3rd Jun, 2009 at 07:45:53pm
On 3rd Jun, 2009 Anton said:
iirc the chambers are the same on the turbo head as they are on the standard n/a head.. SO whats different between these two? Edited by jom on 3rd Jun, 2009. |
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4633 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
3rd Jun, 2009 at 07:53:11pm
The early Turbo castings had a thinner deck as they had enlarged water ways, the Turbo heads were also fitted with larger {8mm}sodium filled exhaust valves, other than that nothing. |
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
4th Jun, 2009 at 11:13:29am
On 3rd Jun, 2009 Turbo Phil said:
The early Turbo castings had a thinner deck as they had enlarged water ways, the Turbo heads were also fitted with larger {8mm}sodium filled exhaust valves, other than that nothing. Dont forget those double valve springs. Own the day
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83 Posts Member #: 6003 Advanced Member |
4th Jun, 2009 at 05:48:23pm
so if i use the normal 12G940 on a turbo engine what should i must do?change springs? |
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559 Posts Member #: 2775 Post Whore Aberdeen |
4th Jun, 2009 at 09:09:10pm
Oh Boy..........Did someone say search button? |
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3594 Posts Member #: 655 Post Whore Northern Ireland |
4th Jun, 2009 at 10:25:28pm
On 3rd Jun, 2009 jom said:
i will use a 18cc +20 pistons , i dont know the CR will would be Youve decided on pistons, and have no idea what your CR will be ???? I strongly suggest you source an engine builder fast. As I dont think you should be anywhere near an engine with statements like that. Edited by stevieturbo on 4th Jun, 2009. 9.85 @ 145mph
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