LAZY CORTINA OWNER nearly finished

D

DYNOED250

Well-known member
well its been 2 years in the making but i can finially see the light, the 5 studs all don on the cortina, the motors in, as is the 3.7 gears and 4 speed box....
manifold, is offically finished, and wiring is nearly complete, full 2 3/4 exhust with semi offset muffler will ensure lots of loud tough cammed of its guts 250 noise...... will have going in under a mounth....... beted do 13 or lesss
 
Might be a lazy owner but that is definitely not a lazy six. Cant wait to hear how it goes. All the best, cheers Tim.
 
Dynoed 250
I Like what you done with your engines and thinking maybe over the long hall to collect a few bits and do what you did with your last motor (to a crossflow of course). Any particular reason you chose that 240 at 50 cam? Did you put those huge over two inch inlet valves in the last one as well. Did have a power estimate for it? I assume you used the 3.7 diff with it? It will be interesting to hear how your new engine compairs? Sorry about all the questions.
 
:> ... The motor that i got 160 odd rear wheel kw was relitivly mild. all it had was 20 over pistons, rollers over sized valves but not the 2 inch ones they were a lil bigger than efi ones. rod bolts, double springs, lots of compresssion, and a 650 holley and pacemaker extractors...
the 240 @ .050 cam was an XU1 holden race grind, except on a 250 billet... this cam has real gental ramps with 322 advetised duration, and when i pulled the motor down it had no wear and i sold it..... i chose that cam mainly because in my very first 250, i knocked a lobe of a cam so i didnt want that to happen again....

with the injectected motor, i wanted lots more power, so i went spastic cam, with 260 at 0.050 and over 560 lift... its around there any how.. big valves long rods, all the great ideas of this sight actually.......

it might be a bit hard to compair between the 2 as last one was an auto and the new one is a manual. i g-teked the old motor and we got a best et of 14.8, but at over 105 mph, if it had of had a decent stall and shift kit it woulda done an easy 13, but it was a major slug of the line, you could boot it from the lights and it wouldnt spin and the car you were racing would get a few car lenghts ahead, then at about 30-50 kph, it would hit cam and fry the tires..... and launch u past the car beside u....
i got a decend digi cam that does video with sound ill try and get a sound recoring of the motor at idle hosted somewhere :>
 
Im assuming its easier and cheaper to fit those bigger 1.9 appox inlet valves on a early crossflow head like a C1 that doesnt have hardened valve seats and use a valve seat protector. Otherswise cost of removing old as well as fitting new seats and valves. What did you do?
 
to fit those valves the old inseert ( hardend seat ) is removed and a new bigger one fitted.. this cost around 800-900 ported and all
 
Dynoed250
Did your redline four barrel manifold fit under the bonnet of your
Cortina (arent they higher than a two barrel manifold). What size air cleaner was on it?
Tim
 
The 4barrle redline manifold fitted easly, you can fit ya standard sized v8 air cleaner, and it all fits under the bonnet, my mate had a 2 inch spacer plate, and a velocity stack on top of his 4 barrle in his cortina it went out the bonnet
 
Dynoed 250, did you get an flow figures on the cylinder head? I was considering going to the bigger valves but was not sure whether I was going to get any gain in flow. I am currently still using standard EFI valves on both inlet and exhaust.
 
all i know is that when the massive clevo intakes went in, it lost flow, due to the chamber shouding the valve, he had to open up around the valve heaps, im pretty sure it ended out on top.... if i was you id worrie about actualy port flow rather than valve sizes for the cost its pretty dear per hp
 
Yeah we had a spare head and that was the same problem we found when going bigger which is why we left it.

The problem I have is that I am jamming a hell of a lot of air through there now with a big turbo so the air speeds are getting very high. The bigger valve would halp reduce the losses at high air speeds.
 
hmmm, have u had a play with the over head cam engines, there standard valve size is nearly the same as my hottie 250 size
 
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