DamirGTI 342 Posted May 10, 2007 Hi ! I have 1.9 D6B engine with 11.1 CR (flat top pistons) potred head , 3 angle seats ... and have problems with ignition - engine now detonate on factory ignition timing . I've set timing now almost to the end beyond 5 degree and it is ok. detonate only in 4-th or 5-th on full load started from 2000rpm in these two gears on 98 octane gas , but idle speed is now bad which I can't adjust revs jumping all over from 700rmp to 1000-1200rmp and most importent engine has no power What would be the cheapest solution to make mappable ignition ? I've try sending e-mails to :http://www.h-h-ignitionsolutions.co.uk (for distributor springs changing) , but with no luck can't get in touch with them .. Thanks Damir Share this post Link to post Share on other sites
j_turnell 137 3 Cars Posted May 10, 2007 Probably best off getting an after market igntion system such as omex. This was covered recently a search should bring up some results. Share this post Link to post Share on other sites
petert 586 Posted May 10, 2007 Mapped ignition or a recurved dizzy are the two alternatives. You still need 31-32 degs. of total advance for maximum power, but as you've discovered, it will now ping badly in the 2000-3000 region. I'd buy a full fuel/ignition ECU. The cost is not much more and still uses all the same sensors. Share this post Link to post Share on other sites
DamirGTI 342 Posted May 11, 2007 Ok. Thanks How about this Megajolt ? how hard is this for building , installing and setting up by myself ? Damir Share this post Link to post Share on other sites
PumaRacing 2 Posted May 11, 2007 (edited) Hi ! I have 1.9 D6B engine with 11.1 CR (flat top pistons) Are you guessing or have you measured things properly? Without the 14.5cc dish in the standard 1.9 pistons the CR would be 12.3. Edited May 11, 2007 by PumaRacing Share this post Link to post Share on other sites
DamirGTI 342 Posted May 11, 2007 Sorry just guessing The pistons are from 1.9 DFZ engine , but same sa the ones in 1.6 engines althou i didn't mesure precise CR yet . I don't have compression tester Damir Share this post Link to post Share on other sites
Rippthrough 98 Posted May 11, 2007 Sorry just guessing The pistons are from 1.9 DFZ engine , but same sa the ones in 1.6 engines althou i didn't mesure precise CR yet . I don't have compression tester Damir Even if you did it wouldn't really help you with the exact compression Share this post Link to post Share on other sites
DamirGTI 342 Posted May 11, 2007 Yes , me thinks that almost all compression testers gives different readings when compared to each other .. Share this post Link to post Share on other sites
benlilly 0 Posted May 15, 2007 Hi Damir, You need to calculate the compression ratio of your engine. Have a look here for a clear and detailed explanation Pumaracing A compression tester will only really measure how well the rings seal and if there are any valve clearance problems. Share this post Link to post Share on other sites
