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Big valve head


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Hi I use to own an irmscher GTE exclusive that had a unique steering wheel and Irmscher graphic on the back of the hatch. I remember it fondly, it also had a big valve head conversion and I always wondered what extra performance that have it over standard, just wondered if anyone knows ?

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16 hours ago, Martin 123 said:

Thanks no it was definitely a GTE Exclusive but had the irmscher kit rather than the later exclusive ones. 
 

the previous owner said he gave it a big valve head conversion so it didn’t come from new with the mod 

Oh, I see!  Without knowing the spec it would be hard to say. However, the std CIH head is what restricts the power of the CIH engine as a whole, so any increase is a benefit. I do think there was 45mm inlet & 40mm? Exhaust valves off the shelf option that was pretty common. But as a modification alone, you would not be looking at much of a power increase of 5-6bhp with an increase in the top end useable revs.

 

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7 hours ago, ®evo03 said:

Was told one 2.2 Carlton valves fit em, never tried or tested. 

Yeah think that’s right, the Larger valves are what’s fitted to the Later 3.0 12v engine (Senator/Monza)of 45/40mm 

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On 12/10/2022 at 15:04, Jessopia74 said:

Oh, I see!  Without knowing the spec it would be hard to say. However, the std CIH head is what restricts the power of the CIH engine as a whole, so any increase is a benefit. I do think there was 45mm inlet & 40mm? Exhaust valves off the shelf option that was pretty common. But as a modification alone, you would not be looking at much of a power increase of 5-6bhp with an increase in the top end useable revs.

 

You need a nice cam as well 🙂

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