| Page: |
| Home > Help Needed / General Tech Chat > optimum compresion ratio for boost | |||||||
 982 Posts Member #: 97 Post Whore Near Daventry, midlands |
18th Jan, 2006 at 09:57:24pm
obviously there must be an optimum c/r to run when running a certain amount of boost and optimum level of advance, is there any way of calculating this? Obviously it'd change with boost, but does it depend on anything else.
Edited by andeh on 18th Jan, 2006. I've seen the future and tbh its Pie
|
||||||
|
982 Posts Member #: 97 Post Whore Near Daventry, midlands |
18th Jan, 2006 at 09:59:50pm
im not entirely sure if that makes sense :( I've seen the future and tbh its Pie
|
||||||
|
Site Admin  15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
18th Jan, 2006 at 10:02:18pm
I think the main thing is avoiding detonation. There are many factors that affect this, squish, head chamber shape, flame propogation, blah blah blah!
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
||||||
|
1641 Posts Member #: 178 Post Whore stowmaket suffolk |
19th Jan, 2006 at 08:58:42am
ill be running tests on this during the year.
always looking for them bigger bunches of bannanas |
||||||
|
63 Posts Member #: 834 Advanced Member Falmouth, Cornwall |
19th Jan, 2006 at 11:07:53am
On 18/01/2006 22:02:18 Tom Fenton said:
Maybe a good back-to-back test for MAGA7INE in the future? Take a 1293 turbo engine with low CR, power test it, then swap the head for one with smaller chambers, and test again. Brave or stupid! Great idea Tom! This is in fact part of the 998 turbo feature. I have 2 12G295 heads, one cut for 9:1 CR, one stock 28cc chambered. As I have megajolt, I am going to give this a go on the RR. (More control over advance so we can see optimum advance values for a known combination). Starting with the 9:1 CR head and seeing how high we can go in terms of boost, playing with the advance, then going lower CR and seeing what we loose in low rpm power and BSFC. In fact the pre turbo base line runs were done yesterday, with megajolt optimised for the current motor :). To say I am staggered at the results of a ST1 kit and good 12G head and mapped ign would be an understatement! (well, ok, it's not a Ferrari but not bad for what it is...) Anyway, at lease we know about the REAL increases on an optimised engine, something that most peeps don't do, so we are testing the power the turbo adds, not the power the RR man added optimising the turbo over a poorly set up engine in the first place. The other factor is cam choice as bigger cams, even the MG metty NA cam, will enable you to run more CR as they bleed off cylinder pressure at low rpm. This I think will require VERY careful ignition control under high MAP values, easy with MJ but not something I would try on a clockwork antique igition system. Also, when I had MJ on the test rig, it looks like up to a given rpm it is a multiple spark discharge system! Probably to help with emmisions. On second thoughts, I will replace this with a really interesting article on how to grease your ball joints! LMAO!!!! Peter
|
||||||
|
Site Admin 15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
19th Jan, 2006 at 01:11:10pm
Grease your balljoints? How do you do that??
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
||||||
|
982 Posts Member #: 97 Post Whore Near Daventry, midlands |
19th Jan, 2006 at 01:45:49pm
alternatively you could do endless brake articles, or possibly disjointed suspension articles or maybe an article on injection which doesnt actually give any information other than u can buy it from minispeed.
I've seen the future and tbh its Pie
|
||||||
|
63 Posts Member #: 834 Advanced Member Falmouth, Cornwall |
19th Jan, 2006 at 02:35:52pm
On 19/01/2006 13:11:10 Tom Fenton said:
Grease your balljoints? How do you do that?? LOL  Well Tom, I didn't know until I saw it in a magazine. It wasn't in the Haynes manual or in a forum anywhere. My advice is never trust a man who needs an whole A4 page of pictures to get his tool on a pair of nipples. This is something that should come naturally :) I HOPE to do the next phase next week, though the amount of spare time I have is laughable so it will be whenever I can fit in. Will let you know of course! Peter Edited by MAGA7INE on 19th Jan, 2006. Peter
|
||||||
|
5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
19th Jan, 2006 at 03:13:03pm
doesn't your CR depend on your cam timing as well?
AlexF |
||||||
 4559 Posts Member #: 786 Post Whore Bermingum |
19th Jan, 2006 at 08:14:46pm
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
|
||||||
|
5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
19th Jan, 2006 at 09:15:42pm
hmmm the miller effect Edited by AlexF2003 on 19th Jan, 2006. AlexF |
||||||
| Home > Help Needed / General Tech Chat > optimum compresion ratio for boost | |||||||
|
|||||||
| Page: |