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Old 06-03-2021, 07:56 PM   #1
pete r
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Default Tickford-Yella Terra Heads

I though this may be on interest...

I managed to pick up a couple of heads from a Tickford TE50. Apparently theyíre 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. Itís an interesting comparison.

Iíll 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 -

http://

http://

Milling to reduce shrouding around larger inlet valve -

http://

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

http://
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Old 07-03-2021, 08:50 PM   #2
XC50077
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Default Re: Tickford-Yella Terra Heads

Great Pics,
Are intake and exhaust valve retainers and keepers the same?
Cheers
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Old 04-05-2021, 04:00 PM   #3
pete r
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Default Re: Tickford-Yella Terra Heads

Looks that way...
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Old 04-05-2021, 04:13 PM   #4
pete r
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Default Re: Tickford-Yella Terra Heads

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...

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Old 04-05-2021, 04:18 PM   #5
pete r
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Default Re: Tickford-Yella Terra Heads

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

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Old 04-05-2021, 04:19 PM   #6
pete r
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Default Re: Tickford-Yella Terra Heads

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


Last edited by pete r; 04-05-2021 at 04:26 PM.
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Old 04-05-2021, 04:24 PM   #7
pete r
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Default Re: Tickford-Yella Terra Heads

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


Last edited by pete r; 04-05-2021 at 04:27 PM. Reason: pic tag not working
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Old 04-05-2021, 04:35 PM   #8
pete r
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Default Re: Tickford-Yella Terra Heads

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!

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