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Home > Beginners Tech > Lowering compression ratio | |||||||
69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 06:46:39am
Hi all,
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![]() 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
1st Dec, 2016 at 08:28:54am
is it skimmed at all,
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 08:56:05am
Where I am I can only make the job myself... Router could be faster than a dremel I admit what are your thoughts on the round chambers ? Don't see how to get 30cc keeping the beak |
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![]() 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
1st Dec, 2016 at 10:22:14am
28cc is common with the beak still in, on an unskimmed head though.
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 11:05:44am
Pistons ? For the use in turbocharged or to get the cr low enough because of their dish ? |
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![]() 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
1st Dec, 2016 at 12:21:46pm
Yep, with 24cc in the head i was at about 8.2:1 on a 1380 with 18cc pistons.
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 12:31:19pm
Yes they are said to be 7cc but when I measured the dish with a syringe it was more like 5/6.
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![]() 4619 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
1st Dec, 2016 at 12:44:40pm
Round chambers are far from ideal as they'll produce no mixture motion or squish, but it doesn't sound like you have much option.
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 12:59:00pm
Cometic gasket is really not an option? |
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![]() 489 Posts Member #: 9159 Senior Member Devon |
1st Dec, 2016 at 01:02:39pm
Whereabouts are you? I have a head I'm putting up or sale shortly and the chambers are 28cc |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 01:06:25pm
If you don't mind shipping to Mauritius i'll take it !
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![]() 696 Posts Member #: 10034 Post Whore Birmingham |
1st Dec, 2016 at 05:04:08pm
On 1st Dec, 2016 minimauritius said:
...I would need another 5cc somewhere to make it closer to a compression of 9/1 (not looking for a lot of boost)... Factory engines ran 9.4:1 CR for 7psi with old technology ignition, safety margin for low octane fuel, no intercooler, poor servicing, unmonitored AFR, unmonitored knock, generic profile SU needle etc etc etc. Dependent on whether you can improve on some of these, you may not need a CR as low as 9:1. Exactly how much boost do you want to run? |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 05:29:32pm
Really not much, standard will be fine 7psi would be the max. I'm not looking for huge power but good torque. |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 05:37:58pm
At the beginning it would be no intercooler, standard timing from my 123 distributor (metro turbo curve), I did some needles filing already so should be able to improve the fueling a bit ( I have an AFR gauge).
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
1st Dec, 2016 at 05:50:00pm
28 cc in the chambers would bring me to 9.4:1 |
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![]() 489 Posts Member #: 9159 Senior Member Devon |
1st Dec, 2016 at 08:41:33pm
Had a quick look at postage and your looking at £250+ just for postage costs... sheeeeeit!!! |
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![]() 2091 Posts Member #: 9894 Post Whore Dorking |
1st Dec, 2016 at 11:06:18pm
Why no intercooler to start with? Take the time, do it once, do it right. |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
2nd Dec, 2016 at 09:47:56am
On 1st Dec, 2016 jamestar said:
Had a quick look at postage and your looking at £250+ just for postage costs... sheeeeeit!!! Anyway the customs would block it as it is a used part. I can only receive new parts so they can get the VAT on it.. |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
2nd Dec, 2016 at 09:52:10am
On 1st Dec, 2016 jonny f said:
Why no intercooler to start with? Take the time, do it once, do it right. I'm after a standard look in the engine bay and don't want the big intercooler hoses unless I can make them pass in the wings |
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102 Posts Member #: 155 Advanced Member |
11th Dec, 2016 at 06:08:41am
You'd have to run a silicone hose from the turbo to your inlet so you might as well pop an intercooler cooler on , a nice slim but long one .. ? About 60 bucks .. |
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![]() 2974 Posts Member #: 10749 Post Whore lowestoft suffolk |
11th Dec, 2016 at 10:39:08am
In the space of a few inches? On 24th Oct, 2015 jonny f said:
Nothing gets past Dave lol NOTHING GETS PAST ME!! ![]() 1/4 mile 14.7 @ 96mph 12psi boost Showdown class A 2nd place 18.6 @ 69mph |
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![]() 1750 Posts Member #: 10190 Post Whore belgium |
11th Dec, 2016 at 05:33:25pm
I do it with a dremel. Only 7 hours per chamber you can do anything if you set your mind to it...
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![]() 4619 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
11th Dec, 2016 at 06:31:56pm
On 11th Dec, 2016 Rammie2000 said:
I do it with a dremel. Only 7 hours per chamber 7 hours !!!!!! Jeez. Do you have a compressor ? If you why not invest in a cheap die grinder ? Phil. |
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69 Posts Member #: 10545 Advanced Member MAURITIUS |
17th Dec, 2016 at 10:56:23am
I burned two dremels just to get 3cc from each chambers.
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![]() 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
17th Dec, 2016 at 11:24:49am
Theres 2 cometics listed, think one is under sprite, or something in-line mounted, they are a good gasket, but you need a block and head that's been surface ground rather than just milled.
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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