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Got a spare 2.0ltr cih engine and fancy building somehing with good power to put in my cav, don't wanna spend loads. And can do all work myself, minus machine work, what cheap cams, crank etc options are ther to use, also where can i get them? Help would be much appreciated

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Hi mate :)

There are many ways to go about tuning a CIH. What you should start with is find out how much you want to spend on the project, and find out what it will cost you to rebuild the stock engine with new bearings, gaskets etc. This needs to be done if you want a good engine that can run for many years.

But my suggestion would be the following for a 2,0 ltr setup:

1,6 crankshaft, balanced and weighed

Getting the pistons and rods weighed and balanced by todays standards

New main bearings

If you can find someone that can balance everything together it would be the ideal solution. But remember the hardware of a CIH engine is 20+ years old, so just getting it balanced by todays standards will give you a very big advantage.

All the power gain you want is primarely isolated to work on the head.,

My first choice would be a 2,2 or 2,4 head as this need no work on porting etc. If you can not locate one for a fair price, and the 2,0 head must be your choice you need to get the head intake ports worked over and flowed. The exhaust ports are good as they are. You will need a CAT cam, or similar. The 2,0E has the best cam in the CIH range so this can be used for a start if you want.

Use 46/41 mm valves from the C30NE (goldtop 12valve R6 engine Senator / Carlton) they are cheap, and are the maximum valve size the 4 cyl CIH can take without modifying the head alot.

Get a set of Webers or Dellorto´s (bike carbs can also be used). With DHLA Weber you need 40mm bodies with a 36mm venturi (choke) setup and a 4,5 auxillary venturi setup. Mount F16 emulsion tubes, acc pump jets should be 45s, 145 main jets and 55 idle jets. Will give you great power and drivability as well as a sensible fuel consumption.

Keep the original exhaust manifold (they are the best) but mount a 2" sports exhaust system from the manifold and out.

The cam is where most of the power will be unleashed. Getting a good street cam will gain you 20hp whereas a agressive camshaft can give you twice that and more... But remember that your original valvesprings and hydraulic lifters will only take so much. They begin to float at around 6-6500rpm. If this happens you will need to change to solid lifters that can be found on any 1,6 ltr CIH engine. Stronger springs can be purchased several places.

I recommend a ENEM y12 camshaft, with your original lifters and springs. They are from Sweden and ENEM has a great customerservice.

With a Y12 cam and the above setup, i would say 150-60ish hp should definatly be within reach.

For a good 2,0 engine i would however suggest you find a 1,9 block to use as this has better cooling.

As a sidemark, if you are looking at a bigger budget the work on the head should be the same as descriped above. But you can instead use those extra money on a stroker engine, and you can go as high as 2,7 liters volume.

You can build a good 2,3 ltr engine with a 2,2 crank, a 2,5 ltr with a 2,4 crank or a massive 2,5 with parts from the 2,3 Diesel CIH if you want. Build correctly theese diesel part engines can run forever and take alot of beatings.. Let me know if you need any tips on how to stroke and bore the CIH´s ;)

Edited by monzta
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Liking the sounds of these, think I will go with the 1.6 crank with a 2.2 or 2.4 head, solid lifters and a mild race cam, i have a set of fireblade carbs that were ran on a 2.0ltr zetec so. these should work on the cih, should I be able do do this for shy of £500? Can the head be skimmed to boost comp? If so by how much, also should I use the 1.6 flywheel? Is it lighter? Where is the best places to get the part?

Thanks

Josh

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Liking the sounds of these, think I will go with the 1.6 crank with a 2.2 or 2.4 head, solid lifters and a mild race cam, i have a set of fireblade carbs that were ran on a 2.0ltr zetec so. these should work on the cih, should I be able do do this for shy of £500? Can the head be skimmed to boost comp? If so by how much, also should I use the 1.6 flywheel? Is it lighter? Where is the best places to get the part?

Thanks

Josh

As said you need to rebuild the entire engine when tuning it, so complete set of new gaskets top and bottom, new bearings, new piston rings would be a great idea, and of course the machining work done when parts are balanced. I think you would need a bit bigger budget but as said, you can scrap the 2,2/2,4 head for starters and just go with a 2,0E head.

Regarding the 2,2/2,4 head yes you can get them machined around 1,5mm but the power gains are marginal. CR is not where you find power, best power output are given by good flow of the CIH head.

Regarding the flywhell, get it lightened and balanced. You can take 2 kg of the original weight with no problems.

I have never worked with bike carbs before so i cant really help you on that one im affraid :)

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