Which Engine?

Originally, I had my heart set on a v8. I blame Mad Max personally! Actually I did consider a bike engined car for some time, as they must surely be the daddy on a track, but ultimately I want a car that I can thrash on track, enjoy on the roads, and also use for the odd weekend away with the missus. A BEC really isn't going to suit all of those demands. (In an ideal world, I'd have one of each of course...I could quite fancy a Silva R1ot as a track blaster...)

So I'd pretty much decided on a v8. When I started researching originally, I concluded that the venerable Rover v8 was the only choice. Small and cheap per BHP. There didn't really seem to be anything else. So I bought the books, did my research...and felt a bit...hmmm. Despite being cheap to buy, you still have to spend quite a lot to get decent power. 3-4500 seems to be fairly ballpark for a 250hp engine. In addition, the power band is very low - running from around 2000-4000rpm. Personally I wanted something a bit more responsive and revvy. No disrespect to v8 owners mind - they are super fast and sound the absolute business...but I think maybe they're not for me after all.

So I started looking again, casting my net a bit wider to include v6 engines as well as v8, looking for something that can produce 250hp (and preferably more) without costing the earth. I didn't want a turbo engine - despite currently owning a turbo car which is great, I do prefer the power delivery of an NA engine. Supercharging has always seemed more appealing to me anyway, despite turbos being ultimately more powerful.

I Spent a vast amount of time reading, asking questions on various forums, and talking to tuning companies. I've summarised my findings and thoughts below; this is all correct to the best of my knowledge, but don't take it as gospel! Costs especially are my own estimates, and you'll find widely varying figures floating around; I've tried to be realistic based on what people have actually spent, rather than what tuning companies say in their marketing. Weights can also be the subject of much debate.

Engine Weight Size Power Cost Comments
BMW V8 (various) ? Width: ~ 750mm 230 hp from 3.5L
394 hp from 4.9L
? These are no doubt great engines, but their major drawback is their size; being overhead cam, they stick out a lot more than the pushrod type engines such as the rover. One has, apparently, been fitted to a Rush just recently, but by the sound of things, the chassis is quite considerably modified, and bits of it stick out of the sides of the car. The other problem is that there seems to be zero aftermarket tuning for them; so no chance of increasing the power at a later date.
Rover V8 480lb for a 4.0L + ancilliaries 508mm wide
700mm long
650mm high
Small. Fuel economy pretty poor. Cheap for up to 220-230hp,then exponentially more expensive. Low revving, with the power band being below 5000rpm as stock.
You do see weights as low as 320lb being quoted, but based on my research, I don't believe these.
Chevvy 350 / 305 V8 530lb Unknown, but of a similar size to the Rover 320hp and up 3500 for a crate engine These old engines produce good power for the money, but are waaay to heavy. And being large-displacement old fashioned designs, are also very thirsty.
Chevvy LS1 V8 497lb Similar to the Rover 350hp and up 4500 - 6000 The LS series of engines comes up in every conversation about which engine to choose. Much better in terms of economy and weight than the old chevvy lumps, and still good value for the power you get.
But for me, still too heavy, too expensive (gearboxes for these cost another 1800), and a bit too big for a 7. A car that small shouldn't really need 6.2 Litres, surely?
Ford 302 GT40 v8 424 lb 610mm wide
737mm long
699mm high
345hp 3345 (long engine), say 5000 This would probably fit, though it is getting a little on the long side, and is quite heavy again. Good power for your money, but still rather a lot of money.
Ford Cosworth 24v V6 308lb 670mm wide
600mm long
700mm high
203-230hp stock Cheapish (I forget exactly what this means!) The power delivery and rev range seems much the same as the rover, i.e. quite a low revving engine. Quite a lot of tuning available, although I hear some say that it is starting to get hard to find parts. Definately fits (though it's tight) as at least two Rushes are being built with these in right now.
Nissan VQ35DE V6 (from the 350Z) <300lb 610mm wide
737mm high
200-300hp Expensive! Revvy engine, one has recently been fitted to a Rush. A bit on the expensive side though, and hard to tune, from what I've read.
Volkswagen VR6     180hp from 2.9L   A bit too small, and not terribly powerful. Would probably fit well as it is a "staggered inline 6" rather than a true V6, with a single cylinder head. Could not find much aftermarket tuning stuff (seems to be a theme with German manufacturers?)
Alfa Romeo V6 375lb 590 mm wide
560mm long
700mm high
3.0 Engine - 210hp
3.2 Engine - 250hp
Can buy a whole car with a 3.0 in for 300, 3.2 seem to be as rare as hen's teeth... Look great, sound great. Rev to around 7000, and very oversquare so should be quite responsive. Tuning is available (though not cheap), with increases in capacity to 3.5 or even 3.8L, cams etc. Can also be supercharged to around 300hp using the stock ECU. One has been fitted to a Rush, so it fits. Major drawback is that they are all FWD installations, so will require adapting to fit a RWD gearbox.
Honda "C" series V6 (eg C35A) ? ? 225hp   90 degree bank angle means that this is probably a bit on the wide side. Can find zero aftermarket tuning either.
Honda "J" series V6 ? ? 265-300hp   60 degree bank angle so more likely to fit; unfortunately this is a very new engine and seems to be mainly for the US market.
Toyota V6, VZ series (1VZ-FE to 5VZ-FE) ? ? 190-200hp from 3.4L   Designed for high torque at low RPM. Output seems to be no more than a mildly tuned 3.5 RV8 produces, and with a very similar power band, so not much point.
Toyota V6, MZ series (1MZ-FE) 401 ? 225hp from 3.3L   Only available from 2003 on, so likely to be expensive still. Doesn't seem to offer much over the Rover, apart from perhaps economy and slightly less weight.
Toyota V8 1UZ-FE 363lb 770mm wide
700mm long
700mm high
265hp Around 2800, including gearbox Amazing engines, so smooth that they can be bounced off the rev limiter with a coin balanced on edge on the rocker covers. Bullet proof bottom ends, loads of aftermarket tuning available. Cheap (around 400), though only came with an automatic gearbox - they need an adaptor for a manual and an aftermarket ECU to run without the original gearbox. Very cheap for the power though. Much to my dismay, just too darn big; no doubt could be made to fit like the BMW, but I don't want to compromise the look of the car that much.
Ford Duratec V6 (from the Mondeo ST) 451lb 670mm wide
685mm long
680mm high
200-240   The bare engine is 670mm wide, but the alternator sticks out more than the heads. All alloy, but still rather heavy
Mitsubishi 6G72 (GTO / Shogun 3.0V6) 350lb 585mm wide
500mm long
610mm high
160-220hp 400-1000 Very compact, and cheap. The older ones however are not that powerful (sub 200hp). Tuning is limited to turbos or superchargers, and there seems to be a lot of issues surrounding the latter.
Mitsubishi 6A12 V6 (2.0L, from the FTO)   Not sure, but tiny; the 6A series includes the world's smallest production V6 180hp @ 7000rpm   Very compact and revvy. Will fit in a new Colt, so would surely fit in a Rush. FWD so would require adapting to fit a RWD gearbox. No tuning really available, most people seem to swap in a 6G series instead.
Vauxhall ecotec v6 3.0L     180hp - 280hp   Little in the way of aftermarket tuning. I've read that it doesn't take to forced induction very well.
Rover KV6 2.5L 200lb   Can be tuned to around 180hp   A bit on the small side really
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