BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Daimler 2.5 fuel delivery
Very nice. I think that's actually the first one of those we've seen on this forum. But your description of operation is exactly consistent with that type. What it lacks is any provision for low load operation, as it was designed for racing. As a result it was never expected to operate under high vacuum and idle was more of an afterthought. It may have some provision for idle tuning or it may not.
For street use you can convert to EFI. That will take some work but if you are willing to do it the results are worthwhile. Jim |
Re: Daimler 2.5 fuel delivery
Hello Jim
Thanks for the input. That’s the way I bought the car. The description is the last owners. I would love to get EFI for it, I just don’t have the knowledge to do it. Carburation would work if I could get enough. I was told it has 12:1 compression and has an 8500-rpm red line. I know it’s is quite thirsty. It runs so rich it smokes like crazy at 2000-rpm and runs smooth and clean at 7500. The plugs fowl at idle in no time at all. That’s why I am looking for other alternatives. John |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Daimler 2.5 fuel delivery
Having someone else convert to EFI for you will be expensive as you would have to install an injector in each throat but beyond that it is pretty straightforward as EFI systems go. However it sounds like you might be better off with a carb. Keep the FI setup in case you sell the car, or sell it on, it is likely quite valuable.
If going to a carb, either a 4bbl or one of the new 4bbl throttle body EFI systems are good choices if you can find a 4bbl intake for that engine. Jim |
88v8 Ivor Duarte Gloucestershire UK (1041 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Daimler 2.5 fuel delivery
That setup looks way overchoked for a small engine, don't see how you will get any coherent airflow at idle.
Seems to me it's for competition pure and simple and anyone into period drag racing might be very happy to have it. As you probably know, very bad for the engine to run so rich, it will cause washdown, and contamination of the oil. Regarding options, the SUs are fine for a road car, beyond that if you post on the DLOC forum someone may direct you into other possibilities. Although they're mainly polishers, there are some people with enthusiasm for pepping things up a little. [forum.dloc.co.uk] There is no factory 4bbl intake, you would have to have one fabbed and then get into setting up the carb on a rolling road. What do you want to do, road use or something more? What car's the engine in, btw? In general, this engine was never very strong and in old age is showing design problems with cracking and maintenance issues with corrosion. Unless it has strong historicity, perhaps not one to sink a lot of time and money into. Ivor |
88v8 Ivor Duarte Gloucestershire UK (1041 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Daimler 2.5 fuel delivery
A chap with good knowledge of these engines pointed out to me that an engine with this sort of (Hillborne?) setup has likely been modified, such that the stock SUs and needles might no longer give a good result. An 8,500 redline certainly suggests that it's a little non-standard.
In that case, if you also want to drive it on the road you may as well have a manifold fabbed and go to a small Edelbrock, it will be a lot easier to tune than trying to regrind suitable needles for the SUs. I believe that there are also electronic systems using repros of the Weber IDA bodies, ah yes here we are [foxinjection.com] but again, there's no stock manifold. However, might be worth talking to Fox as they seem to have a range of manifolds, and see if someone has already gone down this road. Ivor |
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Daimler 2.5 fuel delivery
Just for the coolness of it
Id lookin to Squirting it with EFI Be a fun track car |