jago

Hello, I have been offered a Pair of NEW c27a heads to go with my NEW C27a block I have. However the same person also has:

Should I get the Heads or the Whole 2.5 engine? Also does anyone have any spec on the 2.5?

__________________
1990 Rover 827Si (honda c27a1) -timming advanced (DIY), Decat(diy), 2.5" exhaust(diy), direct cold air feed(diy), EBC yellow stuff front pads, Lowered 1" on Pi springs, 16" speedline alloys, Recaro 1/2 leather seats front and rear, carbonfibre covered dashboard,
nitrous (223hp @ 5673 and 215lbs @ 4829 - 22oct 2007)

 

sam o nela

I'd get them both personally...

The 2.5 is a good engine...there are some slight differences from the 2.7 but most obvious is the lack of a Variable Intake Valve plate and the 2.5 uses vacuum advance at the distributor to adjust timing...

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

sam o nela

Oh yeah and I forgot to mention that the 2.5 has 10 less hp

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

jago

so i could swap the manifolds (in and ex) over?

ignition would be intresting.

you say 10hp less, over what c27 is that? the cat or not cat?

i might get both just the the intrest in actually seeing a 2.5

__________________
1990 Rover 827Si (honda c27a1) -timming advanced (DIY), Decat(diy), 2.5" exhaust(diy), direct cold air feed(diy), EBC yellow stuff front pads, Lowered 1" on Pi springs, 16" speedline alloys, Recaro 1/2 leather seats front and rear, carbonfibre covered dashboard,
nitrous (223hp @ 5673 and 215lbs @ 4829 - 22oct 2007)

sam o nela

To my knowledge, with or without a cat, the 2.5 always put out 10 less than the 2.7....

That is to say:

Cat- 2.5 = 151 hp and 2.7 = 161
Non Cat = 2.5 = 161 and 2.7 = 171

I believe the main increase was from the butterflies, displacement and different heads...

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

jago

so gas flowing the heads adding the inlet tract and, a little more ign advance should see her well then,

i'll be looking at this engine monday night all being well

__________________
1990 Rover 827Si (honda c27a1) -timming advanced (DIY), Decat(diy), 2.5" exhaust(diy), direct cold air feed(diy), EBC yellow stuff front pads, Lowered 1" on Pi springs, 16" speedline alloys, Recaro 1/2 leather seats front and rear, carbonfibre covered dashboard,
nitrous (223hp @ 5673 and 215lbs @ 4829 - 22oct 2007)

sam o nela

Actually I would stick with the 2.5 intake manifold for the time being and see about porting it out as it (anecdotally) flows better than the 2.7 manifold due to the lack of a bypass valve plate....

I'm still trying to get my hands on an extra 2.5 manifold to do a complete comparison...

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

jago

had a rough look at the engine. looks ok, dusty but is actually new. was intended for an auto. the intake manifold is way different, biggest things i noted were, design of fuel rail and breather to plenum. the throttle body has somthing sticking out into the moving air. and the ignition has a lot more rom to play (more advance)

i got the heads tonight, got home and opened them up, they are both front heads however one has all valves and exhaust rockers the other has no valves or rockers. still happy as i can play at gas flowing the empty head.

__________________
1990 Rover 827Si (honda c27a1) -timming advanced (DIY), Decat(diy), 2.5" exhaust(diy), direct cold air feed(diy), EBC yellow stuff front pads, Lowered 1" on Pi springs, 16" speedline alloys, Recaro 1/2 leather seats front and rear, carbonfibre covered dashboard,
nitrous (223hp @ 5673 and 215lbs @ 4829 - 22oct 2007)