View Full Version : 1.7 x-flow
Pushrod King
24-01-2007, 18:49
Here are the power plots for my self-built 1700 crossflow fitted in my mk1 escort.Spec:711m block,standard crank,lightened flywheel,highly modified,lightened,stress relieved and polished rods,arp bolts,high pressure oil pump,Kent 264 cam,duplex vernier timing gears and chain,accralite pistons (modified to give 12:1 compression ratio),copper head gasket,old spedeworth 1600 hotrod spec flat head with mexico sized rimflow valves,steel rocker posts and gear,mass exhaust manifold with twin box 2" system, twin 45 webers and aldon vacless dizzy with ignitor.The car weighs 740kilos so goes quite well!!! The power plots were done in 3rd gear!!
Attached Thumbnailshttp://www.turbosport.co.uk/attachment.php?attachmentid=7244&stc=1&thumb=1&d=1162135380 (http://www.turbosport.co.uk/attachment.php?attachmentid=7244&d=1162135380)
http://www.turbosport.co.uk/attachment.php?attachmentid=7247&stc=1&thumb=1&d=1162136474 (http://www.turbosport.co.uk/attachment.php?attachmentid=7247&d=1162136474)
http://www.turbosport.co.uk/attachment.php?attachmentid=7248&stc=1&thumb=1&d=1162136474 (http://www.turbosport.co.uk/attachment.php?attachmentid=7248&d=1162136474)
The bottom lines on the graphs were with a misfire!!!
andypipe
24-01-2007, 19:36
Looks like ive got my work cut out this season. How did you get it down to 740 kg. Cant get mine lower than 770kg
trickymex
24-01-2007, 19:45
you say highly modified rods, would you mind telling us what has been done to them and who did it?????
cheers
Ricky:thumb:
Pushrod King
24-01-2007, 21:06
Andy,I haven't got a fire extinguisher system or some of the bars that are in your car,I also run a 5 link+coilover system on the back which is probably lighter than the leafs that you had.My shell is full of filler though which adds to the weight a little so IF I were to put new panels on it'd weigh less,there are NO holes drilled in any of the panels though. Mind you I probably weigh 30 kilos more than you so it'd even things out:D
Tricky, the rods are from the days when spedeworth ran the 1600 hotrod formula (they were used by a top engine builder)and are basically lightened both ends, where the square lugs used to be is now round(they look similar to farndon steel ones now),the sides have the casting marks cleaned/ground off they are then finished off by being highly polished/stress relieved and balanced end to end and as a matched set.The man who did them is still doing stuff and would still do some if he was asked to( he does heads too).
andypipe
24-01-2007, 21:10
So are you coming out this year
Pushrod King
24-01-2007, 21:13
I'd like to but it's down to money and I'm waiting for an answer about sponsorship:dunno:
andypipe
24-01-2007, 21:20
sponsorship
What the fooks that?pray:
Pushrod King
25-01-2007, 13:35
What the fooks that?pray:
The holy grail of motor racing??:thumb:
dangerousdave
26-01-2007, 00:47
How did it pull 126mph in 3rd??? :clint: mine pulled 104 in 4th at 6500rpm? :confused:
Anyway impressive for a home built engine :thumb: :clap:
Pushrod King
27-01-2007, 18:29
How did it pull 126mph in 3rd??? :clint: mine pulled 104 in 4th at 6500rpm? :confused:
Anyway impressive for a home built engine :thumb: :clap:
Ron Harris thought so too when I met him at Goodwood a couple of years ago (that was when it was a 1660):thumb:
It IS high geared but would actually do 101mph in 3rd at 7250:dance: Scary thing is it actually pulls 8000rpm(I rev it to 8250 through the gears) in 4th which equates to 133mph:clint: and then there's 5th but I've never been anywhere long enough to get full revs.I'm normally looking for the braking point so don't look at the rev counter.
davejupp
07-02-2007, 23:58
My x/flow maded 154 @ wheels on sanspeeds rolling road.made this engine when i was working at caterham cars
RS Combi
12-02-2007, 21:56
I took my combi to sanspeed recently,where after a rolling road set up it made 112 bhp,the main problem i have though is that i dont really know anything about my engine,other than what the guy told me when i bought it
andypipe
13-02-2007, 15:37
My x/flow maded 154 @ wheels on sanspeeds rolling road.made this engine when i was working at caterham cars
Fook me, thats what mine made at the flywheel
Pushrod King
13-02-2007, 19:51
My x/flow maded 154 @ wheels on sanspeeds rolling road.made this engine when i was working at caterham cars
Let's see the power plots then:thumb: Front or rear wheel drive? What's the spec??
Pushrod King
14-02-2007, 20:41
Just found this thread :http://www.turbosport.co.uk/showthread.php?t=114672 it makes interesting reading:tongue:
Pushrod King
21-05-2008, 21:46
Just a quick update: took my car for another session today and to start off with it had less power (160 bhp)than it had before:confused: after playing with the timing we ended up with 149.6 BHP at the wheels which is 180.5 Bhp at the flywheel at 7300rpm.
It was well worth getting it done as we had a couple of problems including a broken rotor arm, he took it up to 8600 rpm:clint: to make sure we'd cured the misfire! Definately doesn't valve bounce:D
andypipe
22-05-2008, 14:33
Mmmmmmmmmmmmmmmmmmmmmm intresting
what do you think the bhp gain on a fairly standard 1700 is with 40's, and 45's, over a twin choke?
dangerousdave
22-05-2008, 15:11
The same as a fairly standard 1600...not a lot.
You can get 110bhp easy with a 1600 on a twin choke, at that level twin 40's arent really needed as theres not a lot of gain, its only when your aiming for more power you need them, or if the fashion scene says you need them :D and 45's for big power...say 140 plus :thumb:
Pushrod King
22-05-2008, 17:40
what do you think the bhp gain on a fairly standard 1700 is with 40's, and 45's, over a twin choke?
+5bhp but -10mpg:D
Pushrod King
22-05-2008, 22:06
Mmmmmmmmmmmmmmmmmmmmmm intresting
Hows that Andy???
andypipe
23-05-2008, 10:41
Just gonna have to peddle harder to try and keep up with you
Pushrod King
23-05-2008, 14:46
Just gonna have to peddle harder to try and keep up with you
Doubt it, I've got to try and keep up with you:thumb: Don't forget Mr Bahr says the rollers I use read about 10 bhp high.
Tricky, the rods are from the days when spedeworth ran the 1600 hotrod formula (they were used by a top engine builder)and are basically lightened both ends, where the square lugs used to be is now round(they look similar to farndon steel ones now),the sides have the casting marks cleaned/ground off they are then finished off by being highly polished/stress relieved and balanced end to end and as a matched set.The man who did them is still doing stuff and would still do some if he was asked to( he does heads too).
would it be possible to have a go at this at home ? or would it screw the ballance?
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