Tickford-Yella Terra Heads

[pete r]

I though this may be on interest...

I managed to pick up a couple of heads from a Tickford TE50. Apparently they’re the same as the 220kW heads, ie larger valves, ported by Perfectune/Yella Terra.
Today I put them on the bench and lined them up with a standard intake manifold. It’s an interesting comparison.

I’ll now use bearing blue to show where to mod the intake manifold and then break out the old CC Specialty porting gear from my bike racing days!

Manifold ports vs head ports -

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Milling to reduce shrouding around larger inlet valve -

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The Yella Terra milling/porting is easy to see when compared to the normal combustion chamber casting -

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[XC50077]

Great Pics,
Are intake and exhaust valve retainers and keepers the same?
Cheers

[pete r]

Looks that way...

[pete r]

TE50 heads fitted with YT roller rockers and ported lower intake. The rockers are adjustable and 1.7:1 ratio. The only issue is the standard rocker covers won't fit...

[pete r]

A quick trip over to Campbelltown and Sydney Speed Supplies for some spiffy tall valve covers -

[pete r]

The upper intake looked daggy as **** so a touch of Brand New was added -

[pete r]

A 1" intake spacer was required because of the added height of the new rocker covers. And here she is in all her glory!

[pete r]

It's a totally different beast now. Snappy as fook. Exhaust note is totally different, engine seems to have lost a little bit of bottom end but wants to spin like a top.
Must be because of the increase in rocker ratio increasing lift, valve opening and closing speeds and 50thou duration. Bigger valves, increased compression and ported lower intake obviously contributing too.

Off to the dyno next week for a before and after comparison. Then once I figure out Quarterhorse and get it tuned properly then a final dyno reading. The poor old ECU doesn't know WTF has happened!

[pete r]

Before and after dyno results. I couldn’t ask for a better result, no loss of bottom end power, AFR ratio still good and open for tweaking at the top end. And it’s all Ford bits. 250rwhp must be 300+fwhp?

[pete r]

[pete r]

Pic is cropped. Bugga!

[pete r]

Here we go - isn't that the loveliest curve? All gain, no loss

[pete r]

[pete r]

Couldn't get the youtube thingy to work so here's the raw link to the car on the dyno if you want a listen -

https://youtu.be/mAj0swgqVLQ

[GasoLane]

Here ya go.....

Originally Posted by pete r

[speedzter]

Interesting how both curves flatten off around 4500 rpm.
it also appears to go fairly rich at the same point.

[TICKFORD220]

Almost identical power to my old 220kw s3 manual,mine had stock 220 headers,twin manta system,ported lower intake,msd coil packs, advanced cam timing by 2 degrees,made 255 rwhp.
My timing chain was stretched and fkd after 100000km so i replaced with a rollmaster and advanced timing to make it a bit snappier down low.
Mine got tuned by chad at streetbuilt.
Good result there cobber.

[pete r]

Originally Posted by GasoLane

Here ya go.....

You champ thanks Gaso

[pete r]

Originally Posted by speedzter

Interesting how both curves flatten off around 4500 rpm.
it also appears to go fairly rich at the same point.

Yeah interesting aye. I’ve got the quarterhorse talking to the ECU and the laptop, and have some O2 sensor bungs ready to weld onto the exhaust. When it’s all connected I’ll see what the wideband says it’s doing and maybe try leaning things out a wee bit, see if the AFR can be a bit more linear. There might be a few more ponies hiding in there...

[pete r]

Originally Posted by TICKFORD220

Almost identical power to my old 220kw s3 manual,mine had stock 220 headers,twin manta system,ported lower intake,msd coil packs, advanced cam timing by 2 degrees,made 255 rwhp.
My timing chain was stretched and fkd after 100000km so i replaced with a rollmaster and advanced timing to make it a bit snappier down low.
Mine got tuned by chad at streetbuilt.
Good result there cobber.

Cheers digger!
Did the stretched timing chain make any noise at all?

[LoBelly]

Thanks for this update - have recently acquired a '99 XR8 myself and am contemplating my options (also have some of the Tickford 220kw/GT40P heads on my shelf)

Having read Stu's posts on the quarterhorse I'm keen to give that a go

sound like you're very satisfied - would be keen to hear how you go with the tuning etc

[pete r]

No worries mate, I’m starting from scratch and will keep you updated!

[TICKFORD220]

Originally Posted by pete r

Cheers digger!
Did the stretched timing chain make any noise at all?

Not at all,i planned to advance the timing so i got a new timing set,once it came apart i found the the factory chain was rooted.

[auIILTD]

Originally Posted by speedzter

Interesting how both curves flatten off around 4500 rpm.
it also appears to go fairly rich at the same point.

Very typical of a factory tune. I was seeing my AFRs on my stock P250 dip down into the 10s.

Originally Posted by pete r

Yeah interesting aye. I’ve got the quarterhorse talking to the ECU and the laptop, and have some O2 sensor bungs ready to weld onto the exhaust. When it’s all connected I’ll see what the wideband says it’s doing and maybe try leaning things out a wee bit, see if the AFR can be a bit more linear. There might be a few more ponies hiding in there...

Good work Pete. Very interested in following your progress.

I have started a EECV/QH tuning thread. It may help you. Have a read, and if you have any tuning questions, post them there and I will happily assist if I can.
https://fordforums.com.au/showthread.php?t=11478284

Good luck.
Stu

[auIILTD]

Originally Posted by auIILTD

Very typical of a factory tune. I was seeing my AFRs on my stock P250 dip down into the 10s.

Quoting myself, apologies.

Here is a graph I logged of the factory tune in my P250. Factory tune commands stupid rich high in the rev range. Graph uses lambda not AFR on the right scale. Lambda X 14.64 = AFR. Follow the black line.



Same graph with fuelling corrected (2nd gear pull) - again follow the black line.


Cheers
Stu