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Frequently Asked Questions - Westfield
 
Will the 2.0L 16v XE/LN wet sump fit on a Z20LEH engine?
Bellhousing for MX5 gearbox to Vauxhall
2.0L XE Cam upgrade with Webber 45s
 
Will the 2.0L 16v XE/LN wet sump fit on a Z20LEH engine?
Question: Will the 2L 16V wet sump XE\LN also fit on a z20LEH engine. I’m building a Lotus Seven kitcar and will use a z20LEH and would love to have some more ground clearance.

Answer: Although we do not specialise in the z20LEH engine, this engine normally has, as far as I am aware, an extra ladder frame fixed to the underside of the block.  We have removed this from earlier models of engine using the same type with no issues.  This frame is normally added in order to help reduce vibration on the standard road engine near tickover due to emissions.  We have always run the 2.0L XE block at very high rpm, sometimes over 9000rpm with no issues.  You may be able to then get the XE sump to fit, but you will have several problems when doing so; the oil pump on the z20LEH has an oval pick up pipe, the bolt holes in the sump are 6mm diameter where on the later engine they are 8mm diameter, but the biggest problem even if you overcome all the other issues is that a wet sump engine is not ideally suited for use in a Seven type kitcar.  These type of cars are able to pull quite high G forces, particularly with modern tyre technology and the wet sump would not be suitable in its standard form.   

Provided your car is only for road use and driven conservatively, then the wet sump we produce for this type of  car has an amount of oil control (you will be still required modifications as mentioned above).  If the car is to be used for any kind of track use, we would only recommend dry sump.

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Bellhousing for MX5 gearbox to Vauxhall
Question: Just a quick question... Now that Westfield are going other to MX5 running gear, are you considering a bell housing to enable a Vauxhall engine to go on the Mazda Gear box?

Answer:We always keep an eye on the market and see what new products may be of interest to our customers.  The main reason we currently stick to the Type 9 bellhousing is due to the wide range of gearboxes available with this bolt fixing.  Nearly every manufacturer of motorsport gearbox now has a version of gearbox to suit this and this helps to keep our costs down and the range of bellhousings available to a minimum. 

Although the Mazda gearbox seems like a very good gearbox, when developing a new bellhousing the cost from start to finish to holding quantities of bellhousings in stock would be in the region of £10000 cost to us, so we need to be sure that the market will be big enough to recoup the design and development costs before investing in a new product such as this.  The other thing about the gearbox itself, is that the quantities manufactured are fairly limited in comparison with the Type 9 and variants, so this would also limit the use in the wider market such as rallying, racing, etc where the engine outputs are regularly being pushed to 300bhp, at which point a specialist gearbox is then required.  So the Mazda gearbox in it's current form, unless others take up further internal upgrade will not be suitable for higher engine specifications.  Most of our customers, who use the 2.0L XE engine are normally using highly tuned versions so again require a gearbox capable of coping with this, particularly in the rally market where the majority are now using sequential gearboxes.

We do quite often get asked for bellhousings or adaptors to mount uncommon gearboxes to the Vauxhall or Duratec engine and when it is a one-off, I would quite often suggest that the gearbox is placed on the back of the engine and then the gap between the back of the block and the gearbox is measured.  If the gap is then greater for one of our current bellhousings, that they could have an adaptor made to convert our bellhousing to mate to their gearbox.

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2.0L XE Cam upgrade with Webber 45s
Question: I have a Westfield SeiW with a 2L 16v Vauxhall XE in standard tune with MBE ECU & Weber 45s. It was suggested by the WSCC sprint guys to come to you for a cam upgrade kit - taking my standard 175ish XE up to over 200bhp. I want a mild tweek for a bit more push on track/airfield days. Can you offer a mild cam & advice etc for mapping of the MBE ECU & jetting of my Webber 45s to suit?

Answer: I would suggest the cams, springs, caps and platforms from the CK200 kit. As a minimum we would also suggest you had the pistons pocketed. This should push you in the region of 200 bhp. Since the cams are hydraulic there is no shimming involved. This spec is used by quite a lot of our customers who run in the Westfield Sports cars series, both on carbs and fuel injection. They are a nice improvement and give an all round gain in power. You could go for a larger cam profile that involve solid followers and increase the cost, but you would then need to trade off some of the bottom end power. If you are interested in going further than the kit I have suggested, just let us know.
I would recommend the addition of vernier pulleys. You could also add omega pistons, which would boost the compression and in many cases would see the engine performance rise over 210bhp.

Links: Carburettor Kits

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