The characteristics of my DIY engine
15-10-2004, 01:24 PM
#1
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
The characteristics of my DIY engine
I found how my engine is working today...@ 1.3 bar the AFR's started at 11.2 as i come on boost in 4th gear..now thats too rich as my BD10's (grp a rally cams) just cant consume the air....BUT as the revs it gets leaner and by the limiter (7800 rpm) a perfect 11.8,so this tells me my engine works best up top LOL.
15-10-2004, 01:33 PM
#6
PassionFord Post Whore!!
Join Date: Jun 2003
Location: Saving the planet
Posts: 5,749
Likes: 0
Received 0 Likes
on
0 Posts
Its a bit like saying
"today I found out how my Knob works. When I have a semi I can't quite get it in, but when it's hard I found that this works best"
Apologies Phil if this was meant to go anywhere, and I've justed gone off at a tangent
"today I found out how my Knob works. When I have a semi I can't quite get it in, but when it's hard I found that this works best"
Apologies Phil if this was meant to go anywhere, and I've justed gone off at a tangent
Trending Topics
15-10-2004, 01:42 PM
#9
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
Gareth...because the head is Grp A ported!!!!So the engine can deffo consume the air but the cams cant...hence why it leans out when the cams start to work best 
15-10-2004, 01:44 PM
#10
Or what you mean (and what I have told you all along 
), BD10s are shit and fuck up the midrange and only give a small increase at the top end (but not as much as they sacrafice in the mid-range ). You can now see this with your own eyes. Put in the standard / better cams and see the improvement .
), BD10s are shit and fuck up the midrange and only give a small increase at the top end (but not as much as they sacrafice in the mid-range ). You can now see this with your own eyes. Put in the standard / better cams and see the improvement .
15-10-2004, 01:59 PM
#11
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
Mike...it would still whoop your ass
Hmm thinkin about a BD14 inlet and std exhaust.....BUT clearence may be a bitch as my pistons only ever had small valve pockets which are even smaller now after the machine work LOL.
Hmm thinkin about a BD14 inlet and std exhaust.....BUT clearence may be a bitch as my pistons only ever had small valve pockets which are even smaller now after the machine work LOL.
15-10-2004, 02:13 PM
#13
Professional Waffler
Originally Posted by Bosch Man
Gareth...because the head is Grp A ported!!!!So the engine can deffo consume the air but the cams cant...hence why it leans out when the cams start to work best
15-10-2004, 02:19 PM
#14
DEYTUKURJERBS
Originally Posted by Bosch Man
my pistons only ever had small valve pockets which are even smaller now after the machine work
If youve had some of the piston machined to lower the comp it might make the pockets look smaller but the nearest point isnt any nearer the valve is it
15-10-2004, 02:26 PM
#18
Banned
Join Date: Jul 2003
Posts: 7,078
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mike Rainbird
Or what you mean (and what I have told you all along ), BD10s are shit and fuck up the midrange and only give a small increase at the top end (but not as much as they sacrafice in the mid-range ). You can now see this with your own eyes. Put in the standard / better cams and see the improvement .
), BD10s are shit and fuck up the midrange and only give a small increase at the top end (but not as much as they sacrafice in the mid-range ). You can now see this with your own eyes. Put in the standard / better cams and see the improvement .
As Brom would say "oh the pain, the pain"
15-10-2004, 02:29 PM
#19
Originally Posted by Mike Rainbird
..and K2 exhaust - but with over 10mm of lift, they need the valve pockets.... Fantastic cams 
.
.
15-10-2004, 02:36 PM
#21
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
Its a thought..thats all...i doubt if i will change Performance great.
Gareth.......my fuel map hasnt got the normal flat line of fuel...as it holds the boost curve (no spike yet) more fuel goes in the higher the revs...so my engine becomes more efficient at higher rpm due to the fact the air/ratio weakens up when really it should richen up!...so it must be the cams beginning to work more effciently.
Mine uses lo comp 7.2-1 pistons BUT i got 7.9-1 All perfectly done..but i cant be arsed to explain
Performance great.Gareth.......my fuel map hasnt got the normal flat line of fuel...as it holds the boost curve (no spike yet) more fuel goes in the higher the revs...so my engine becomes more efficient at higher rpm due to the fact the air/ratio weakens up when really it should richen up!...so it must be the cams beginning to work more effciently.
Mine uses lo comp 7.2-1 pistons BUT i got 7.9-1
All perfectly done..but i cant be arsed to explain
15-10-2004, 02:39 PM
#22
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
Doug.....i am happy with the cams 
I am just pointing out what i think to be its characteristics.....when i meet you i will bring a BD10 with me and show you just how effecient they are by inserting one in your arse
Mike yes i know they produce power later...this just confirms it to me imo.
I am just pointing out what i think to be its characteristics.....when i meet you i will bring a BD10 with me and show you just how effecient they are by inserting one in your arse Mike yes i know they produce power later...this just confirms it to me imo.
15-10-2004, 02:43 PM
#23
Regular Contributor
Join Date: Sep 2004
Posts: 273
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Bosch Man
....my engine becomes more efficient at higher rpm due to the fact the air/ratio weakens up when really it should richen up!...so it must be the cams beginning to work more effciently.
I aint got a clue if thats right, it just seems to make sense
15-10-2004, 02:43 PM
#24
Banned
Join Date: Jul 2003
Posts: 7,078
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Bosch Man
pointing out what i think to be its characteristics.....when i meet you i will bring a BD10 with me and show you just how effecient they are by inserting one in your arse
15-10-2004, 02:43 PM
#25
Mine had K2s on both sides and one of Nick Waple's heads and a proper works spec 0.55a/r T3/4. It made 436bhp / 419lb ft in the days of proper 98RON (was on 7.7:1 c/r then). I had to have the c/r dropped to 7.54:1 when I bought the car, but it sounded the tits with these cams (much more aggressive than a normal cossie) and went very well in every regard. I only changed this spec as I went to this from my T4 equipped Sapphire and just couldn't abide the way the T3/4 dropped the power off above 5500rpm . Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.
. Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.
15-10-2004, 02:53 PM
#28
Norris Motorsport
Phil, dont forget a change in cam beyond a BD14 will require a change in valve spring/spring platforms in order to accomodate greater valve lift without coil binding.
15-10-2004, 03:04 PM
#29
Too many posts.. I need a life!!
Join Date: May 2004
Location: in the garage fixing yet another oil leak
Posts: 925
Likes: 0
Received 0 Likes
on
0 Posts
when i meet you i will bring a BD10 with me and show you just how effecient they are by inserting one in your arse
cant seem to get any work done when ima is posting!
15-10-2004, 03:08 PM
#30
Originally Posted by Mike Rainbird
Mine had K2s on both sides and one of Nick Waple's heads and a proper works spec 0.55a/r T3/4. It made 436bhp / 419lb ft in the days of proper 98RON (was on 7.7:1 c/r then). I had to have the c/r dropped to 7.54:1 when I bought the car, but it sounded the tits with these cams (much more aggressive than a normal cossie) and went very well in every regard. I only changed this spec as I went to this from my T4 equipped Sapphire and just couldn't abide the way the T3/4 dropped the power off above 5500rpm . Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.
. Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.guess i better start saving for one of these then.
15-10-2004, 04:00 PM
#33
PassionFord Post Whore!!
Thread Starter
Join Date: Aug 2004
Location: Kent
Posts: 4,364
Likes: 0
Received 0 Likes
on
0 Posts
Yes Karl....i know that...although i always thought a BD14 needed double valve springs!!!
Gareth yes i could experiment with timing..although i feel they are timed optimum...bare in mind i will be running a 32 psi boost spike that will fade to 26psi on the limiter At present i feel the power delivery is lively and you can feel the power at the top end right to 7800rpm.
ForeignRS yes at constant WOT
Gareth yes i could experiment with timing..although i feel they are timed optimum...bare in mind i will be running a 32 psi boost spike that will fade to 26psi on the limiter
At present i feel the power delivery is lively and you can feel the power at the top end right to 7800rpm.ForeignRS yes at constant WOT
15-10-2004, 04:59 PM
#35
PassionFord Post Whore!!
Join Date: May 2003
Location: Doncaster
Posts: 5,143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mike Rainbird
Mine had K2s on both sides and one of Nick Waple's heads and a proper works spec 0.55a/r T3/4. It made 436bhp / 419lb ft in the days of proper 98RON (was on 7.7:1 c/r then). I had to have the c/r dropped to 7.54:1 when I bought the car, but it sounded the tits with these cams (much more aggressive than a normal cossie) and went very well in every regard. I only changed this spec as I went to this from my T4 equipped Sapphire and just couldn't abide the way the T3/4 dropped the power off above 5500rpm . Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.
. Obviously it will depend on your head if it is worth switch to a K2 on exhaust and you should speak to Harvey about this, as it would also need a re-map.
15-10-2004, 05:13 PM
#39
PassionFord Post Whore!!
Join Date: May 2003
Location: Doncaster
Posts: 5,143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Rs Gus
Originally Posted by Rs Gus
phil just fit some decent cams u cock
15-10-2004, 05:17 PM
#40
Originally Posted by Matt
Originally Posted by Rs Gus
Originally Posted by Rs Gus
phil just fit some decent cams u cock
and they are a rally cam where they run a restricor