Jump to content
Marlow_simon

Upgrading my CVH lean burn head

Recommended Posts

Marlow_simon

I am a inexperienced Westie owner and novice mechanic! I have recently bought an SEIW 1.6 CVH Westfield with twin Webbers and am already hooked! I love the simplicity of the engine and don’t want to replace it with a newer type or go the turbo/injection/increased capacity route. 

 

I do however want to increase the performance nearer to its full potential without losing drivability (intended use is road and the occasional track day).

 

As a first step I am planning to find out what it is currently producing and have it properly set up on a rolling road.

 

Then I am considering replacing the lean burn head (which was apparently flowed and polished several years ago, but I don’t know how well) with a ported and polished Hemi head, possibly with slightly larger valves. To this I plan to add a fast road cam, solid lifters and stronger springs. Then have the carbs etc re set up and tested on the rolling road.

 

Can anyone tell me if there are any pitfalls to this approach that I should watch out for? I believe the lean burn pistons have a different profile to the hemi ones. Is there any risk of contact between valves and piston? Will I be missing out on potential performance by keeping the current pistons?

 

Any advice very welcome, especially where to get a replacement head, who to get to do the head work and which cam to go for. I am based near High Wycombe.

 

Thanks!

Share this post


Link to post
Share on other sites
DamperMan

Appriciate your desire to keep it pure.    CVH was never a sexy or iconic engine.  But it was a good work horse and could produce power.  For pure drivability you could efi it with escort bits.   There’s a thread on here from last year about that.    I started off with a 1.6 cvh with down draft. Started off with some running issues but once the engine was running right I realised it was not enough for me.  You could spend a load on that engine and get minimal gains.  When ford developed the cvh they ended up with the cvh16v is a good way to go.  (Silvertop zetec) .  Same engine mounts...   

Share this post


Link to post
Share on other sites
Thrustyjust

Quickest and easiest way to make more 'standard' power than a CVH is as Tony says and go Silver top zetec. You will need bits though and wont be cheap by the time you add exhaust manifold, inlet manifold, ecu and tuning. But updates the car. 

The CVH is a contact engine, so if the timing jumps or the common water pump to seized and break the cambelt which killed lots of CVH engines when in company cars etc. The cost for a proper ported head, cam , cambelt, water pump, gaskets , wont be far off a Zetec swop. 

Share this post


Link to post
Share on other sites
Jon Wilkinson

Hi, I started with xr2 engine with ported head, hilift cam with twin 40's and was enjoyable but just wanted more, so now have an xe with probably twice the power, end of the day if your happy with it how it is then leave it as is as it might not be as reliable , but we always nearly want to have more power so never stop upgrading, 16v head off zetec is a possibility but it's upto you what u prefer to do! 

Share this post


Link to post
Share on other sites
Marlow_simon

Thanks everyone. I really appreciate your comments. But I already have another faster car. It may be naive, but I do just want to keep the CVH in my Westie for the foreseeable. I just want it to be a good CVH ;-)

Share this post


Link to post
Share on other sites
Thrustyjust

There are plenty of resourceable places on the web to help on this.:t-up: Ferriday Engineering used to to lots of CVH engines and stretching it to 1.9 litre . Alternatively Burtons may help with the piston and head questions. Its not a really loved engine, not that it was a bad engine, so not many Westies had them in the same way the Zetecs ended up in them. Keep the thread updated with your research and works as will be interesting on where you start to end 

Share this post


Link to post
Share on other sites
Marlow_simon

Thanks Thrustyjust 

I have looked at Ferriday’s website but it looks like they are no longer doing this kind of work.

Burtons have confirmed that the pistons will need to be changed, so I am now considering buying an old engine and rebuilding it over a period while I enjoy the car as it is this year.

Regards

Simon

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

Please review our Terms of Use, Guidelines and Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.