This LRO reader emailed LRO.firstname.lastname@example.org to ask Andrew Varrall about power upgrades for the 2.25 petrol engine.
I want to upgrade my old Rover 2.25 petrol engine. Is it technically feasible to do this with lightweight custom made pistons and connecting rods? I’m also interested in reducing tolerances by using modern milling machines, and bolting on any aftermarket products that can give me some more horsepower.
Robin Cury, Dubai, UAE
There are many companies, such as Turner Engineering and ACR, that specialise in tuning products for the 2.25-litre petrol engine. What power output you achieve is really down to how far you want to go and how much money you want to spend. I wouldn’t advise any major lightening of internal components such as con rods because it’ll weaken the engine. Just stick to removing enough material to balance the engine and then concentrate on camshaft, cylinder head, carburation and exhaust for the power increase.
You need to have a conversation with the specialists – they’ll be able to give you much more specific advice to suit your exact needs.
This workshop advice appeared in the May 2016 issue of LRO. Back issues are available to download on digital devices here.