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Re: Escort Sigma 1600 Race Car
The 'evo' engine looks great, well done
The 'evo' engine looks great, well done
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1968 MK1 Escort 1300GT
1969 'Big Wing' MK1 Escort
1972 MK3 Cortina 1600XL
1984 Sierra XR4i
And other junk I don't like to talk about! -
Re: Escort Sigma 1600 Race Car
Yeah , i read that , with interest! I'd like more clearance , as I had to retard the inlet slightly at tdc , to get that 1.0mm.. And I want to run to 8200rpm! I have been pricing pistons...Have you allready read trough this one
0,5mm of more clearance would not hurt. I believe the risk lays in engine brakes and gear changes with high revs and hot engine where you may get some stretch or play in the belt between them pulleys. This will retard the exhaust cam and may cause the the valves to hit. But at the end of the day who will ever know if such a thing will ever happen or would the belt give even if it would. And you're limiter was at 7500? So you may be off the hook.Comment
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Re: Escort Sigma 1600 Race Car
yeah , tbh , even at 7500 I'm worried . I've sourced a spare head and a scrap 1600 block , think I'll have a practise at cutting valve reliefs.Comment
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Re: Escort Sigma 1600 Race Car
Those valve clearances sound very tight, you are totally relying on the valve springs, any sign of valve bounce and you will clip valves
I would be aiming for 2mm minimum and would not be willing to use much less than that, you could cut the valve reliefs yourself with a spare head and spending some time making a few valve releif cutters, or you could buy them"Horsepower sells cars, torque wins races" - Enzo FerrariComment
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Re: Escort Sigma 1600 Race Car
1,5 mm is less than I would like but I cosidder it to be somewhat borderlining too close but hay racing engines are supposed to have close tolerances right?. I have 2mm now and last time it made best power with that clearance. Hope I dont need to advance it very much this time around. Or perhaps the engine would like to be a bit retard even."Failure is always an option." - Adam SavageComment
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Re: Escort Sigma 1600 Race Car
i have run with as little as 1mm, BUT it leaves very little in hand in case you wrong slot itComment
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Re: Escort Sigma 1600 Race Car
The engine is now in as is the rear axle. The new Pico injectors caused no issuea nor did the new alternator position or even the rear axle. What dis however cause some was the new propeller shaft. It is one cm too long. I couldn get it in place if the car would be on its wheels but it still would not have any movent inwards
Need to get it shortened.
Oh why is the start of every season such a mess and chaos. Three weeks and counting. Once I get the new manifold all done I still need to make it to the rollers in time.
And as if the schedule wasn't giving me enough grief a sudden family chrisis struck. The missus got laid off work
This really puts a strain on the racing budget and calls for some re prioritizeing of things. The start of the season is very questionable now...I'll still try and make the car ready in time even if I were not to enter the race.
Axle after a new coat of rattle can matt black
Very chuffed about the new alternaror position.
The new injectors are brilliant. So tiny and deffo will not get in the way of any airfilter.
"Failure is always an option." - Adam SavageComment
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Re: Escort Sigma 1600 Race Car
oh thats a shame about your missus's job, plough on and get the car ready mate , things hopefully will work out .Comment
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Re: Escort Sigma 1600 Race Car
Thats true. I do believe things have a habbit of working out."Failure is always an option." - Adam SavageComment
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Re: Escort Sigma 1600 Race Car
Managed to plumb in the the oil filter today. I hate plumbing. Especially in tight quarters and with stiff hose. But that one thing i can cross off my list.
But to ballance things up i got one more thing on my list. I test fitted the new manifold and the collector sat quite near to the floor. Much more so than it did with the surrogate engine I just while making the manifold. I must have had the angle of the surrogate wrong and now the collector sits too high. I'll have to see if I can fit the exhaust pipe to it or do I need to modify the manifold somehow
"Failure is always an option." - Adam SavageComment
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Re: Escort Sigma 1600 Race Car
in the above pic , the mani looks like a professionally built one , by a specialist! So I really hope you don't have to modify it...Comment
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Re: Escort Sigma 1600 Race Car
Would it be wise to weld the pipes to the flange in different heights.Since the pipes have larger bore than the ports in the flange I could move the flange position a bit.Tilt the manifold back a bit. The no 1 pipe highest and no 4 lowest. Not trying to center the pipe to the hole in the flange? This would propably do it but would this have some effect in the flow?
"Failure is always an option." - Adam SavageComment
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Re: Escort Sigma 1600 Race Car
I remember reading in the excellent Modern Engine Tuning book by A G Bell , that it is best to have the pipes larger than the head , and IIRC, they found differences in the power by adjusting them higher and lower . ?I'll dig it out tonight and copy the text for you .Would it be wise to weld the pipes to the flange in different heights.Since the pipes have larger bore than the ports in the flange I could move the flange position a bit.Tilt the manifold back a bit. The no 1 pipe highest and no 4 lowest. Not trying to center the pipe to the hole in the flange? This would propably do it but would this have some effect in the flow?
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Re: Escort Sigma 1600 Race Car
could you get a good heatsource and tweak the pipes when hot?Comment
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