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Cylinder head - Mintec head range |
27
October 2003 |
I'm often asked about the range of cylinder heads I do
for Mini Spares/Mini Mania, so here's the low-down…
Although the following range of heads accommodate specific
fitments - like pre-1992 where by-pass hoses and heater take-offs on the clutch
end of the head are used and post-1992 where neither of these exist, and on SPi (single point injection) heads where they don't usually
have a threaded hole for the temperature sender - in reality it is easy to
convert almost any of them to fit any other engine since holes are easily
blocked off - or by-pass hoses not used, water pumps blanked off and drilled
thermostats fitted (see articles on cooling/engine transplants). A list of
which is what and what to do to each to convert is at the end of this article.
For more in-depth descriptions of the head specs, see
article 'Cylinder head - About Mintec Heads' - basically the valve sizes used
have been decided on after extensive and in-depth flow testing/dyno testing.
The sizes used provide the best balance of airflow and gas speed for their
typical uses to give optimum all-round performance. Typically the large-bore
heads have consistently proven to provide sufficient induction flow to produce
up to 118 crankshaft bhp (quality fast road 1380, single 1.75" HIF SU, MSC
inlet manifold, MD286 cam). Finished specifications will change/evolve as and
when anything new/better is discovered.
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C-AHT88 |
Small-bore
'stage 3' spec head. 1.218"(30.93mm) inlet & 1.043"(26.5mm)
exhaust valves in EN214N stainless steel, manganese-bronze valve guides, A+
spec stem seals, 180lb (nominal) double valve springs, nominal 23.5cc chambers.
Suitable for all fast road small-bore engines and lead-free fuel use. Has
by-pass hose and heater valve take-offs. |
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C-AHT133 |
'Budget'
large-bore 'stage 3' spec head. Modified, standard MG Metro spec 1.406"(35.7mm)
inlet & 1.151"(29.2mm) exhaust valves, cast
iron valve guides, A+ spec stem seals,
180lb (nominal) double valve springs, nominal 24.5cc chambers.
Suitable especially for fast road large-bore engines of 1380cc type capacity
where extra chamber capacity is required to keep compression ratio sensible
and lead-free fuel use up to 6,500rpm continual peak rpm limit. Has by-pass
hose and heater valve take-offs for pre-1992 engine types. Near
zero flow-loss from modified standard valves when compared to race-spec
valves. |
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C-AHT135 |
'Budget'
large-bore 'stage 3' spec head. Modified, standard MG Metro spec 1.406"(35.7mm)
inlet & 1.151"(29.2mm) exhaust valves, cast iron valve
guides, A+ spec stem seals, 180lb (nominal) double valve springs, nominal 21.0cc
chambers. Suitable for fast road large-bore engines and lead-free fuel use up
to 6,500rpm continual peak rpm limit. Has by-pass hose and heater valve
take-offs for pre-1992 engine types. Near zero flow-loss from
modified standard valves when compared to race-spec valves. |
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C-AHT136 |
TPi
'Budget' large-bore 'stage 3' spec head. Modified, standard MG Metro spec 1.406"
(35.7mm) inlet & 1.151"(29.2mm) exhaust
valves, cast iron valve guides, A+ spec stem seals, 180lb (nominal) double
valve springs, nominal 21.0cc chambers. Suitable for fast road
engines and lead-free fuel use up to 6,500rpm continual peak rpm limit. Near
zero flow-loss from modified standard valves when compared to race-spec
valves. |
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MSE3 |
Large-bore 'stage
3' spec head. Race-spec stainless steel 1.406" (35.7mm)
inlet & 1.161" (29.5mm) exhaust valves,
manganese-bronze guides, A+ spec stem seals, 180lb (nominal) double valve
springs, nominal 21.0cc chambers. Suitable for fast
road/occasional hill-climb/sprint/auto-test engines and lead-free fuel use.
Has by-pass hose and heater valve take-offs for pre-1992 engine
types. |
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MSE4 |
Large-bore
'stage 3' spec head. Race-spec stainless steel 1.406" (35.7mm)
inlet & 1.161" (29.5mm) exhaust valves,
manganese-bronze guides, A+ spec stem seals, 180lb (nominal) double valve
springs, nominal 21.0cc chambers. Suitable for fast
road/occasional hill-climb/sprint/auto-test engines and lead-free fuel use.
Has NO by-pass hose and heater valve take-offs for post-1992
non-injection engine types. |
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MSE5 |
Large-bore
'stage 3' spec head. Race-spec stainless steel 1.406" (35.7mm)
inlet & 1.22" (31.00mm) exhaust valves, manganese-bronze
guides, A+ spec stem seals, 180lb (nominal) double valve springs, nominal 21.0cc
chambers. Suitable for fast road/occasional hill-climb/sprint/auto-test
engines and lead-free fuel use. Has by-pass hose and heater valve take-offs
for pre-1992 engine types. |
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MSE6 |
'Budget'
large-bore 'stage 3' spec head. Modified, reconditioned standard MG Metro
spec 1.406"(35.7mm) inlet & 1.151"(29.2mm)
exhaust valves, cast iron valve guides, A+ spec stem seals, 140lb (nominal)
single valve springs, nominal 21.0cc chambers. Suitable for fast road large-bore
engines and lead-free fuel use up to 6,500rpm continual peak rpm limit. Also
limited valve lift use (max 0.420" valve lift). Has NO
by-pass hose or heater valve take-offs for post-1992 cars
including single point injection. Near zero flow-loss from modified standard valves when
compared to race-spec valves. Can be up-rated for more valve lift by simply
fitting C-AEA526 double valve springs. |
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MSE7 |
MPi large-bore 'stage 3'
spec head. Race-spec stainless steel 1.406" (35.7mm) inlet
& 1.161" (29.5mm) exhaust valves, manganese-bronze
guides, A+ spec stem seals, 180lb (nominal) double valve springs, nominal 21.0cc
chambers. Suitable for fast road/occasional hill-climb/sprint/auto-test
engines and lead-free fuel use. Has NO by-pass hose and heater valve
take-offs for post-1997 twin point injection engine types
(alternator bracket bolted to head). |
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MSE9 |
Large-bore
'stage 3' spec head. Race-spec stainless steel 1.406" (35.7mm)
inlet & 1.161" (29.5mm) exhaust valves,
manganese-bronze guides, A+ spec stem seals, 180lb (nominal) double valve
springs, nominal 24.5cc chambers. Suitable especially for fast
road large-bore engines of 1380cc type capacity where extra chamber capacity
is required to keep compression ratio sensible and lead-free fuel use Has
by-pass hose and heater valve take-offs for pre-1992 engine
types. |
To change pre-1992 head to post-1992 fitment (except TPi) -
Fit heater take-off blanking plate (p/no. 2A180) and
gasket (p/no. 88G221) and fit by-pass hose blanking cap (p/no. CAM4126) or remove
by-pass hose adaptor and fit blanking plug (p/no. 88G619). For single point
injection only - blank water temp gauge sender unit hole off with 5/8"UNF
threaded plug (p/no. 5/8UNF).
To change post-1992 head (including TPi variants) to pre-1992 fitment -
Drill 9/16"/14.5mm hole through counter-bored
heater take-off hole (1/4UNF heater tap retaining stud holes are already in
place) or remove blanking plate if fitted. For by-pass hose, either drill/tap
5/8" UNS (16TPi) port in required place and fit by-pass hose adaptor p/no.
12A2075, or drill/tap 5/8"UNF and fit adaptor p/no. 12H1405, or blank
water pump port off with blanking cap p/no.
Anything beyond this - i.e. for specific applications
like full race and so on, contact me direct.