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jagman

Re-engineing a Riley with a 210 engine and trans

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Yes, I am putting a 210 engine in my Riley sedan for touring.  Years ago I was pit crew for a racing 210 and it had a replacement carb that I would like to get but don't remember what it was.  If anyone has recommendations I would appreciate hearing from you.  If anyone out there has motor mount brackets for the a15 I could use them as well.  Steve

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First what model Riley? One Point Five? RMA RME? Elf Kestrel? Regardless I love Riley cars. The prewar stuff is super cool.

 

So to your question; if the 210 in question was an SCCA ITC what your looking for is a Weber 32/36 DGEV.  The Weber/Mikuni DCOE style carbs were used on GT-5 / GTL cars. Datsun1200.com has loads of info on A-series engines.

 

The key to A-series motors are the cylinder heads; the 210 emissions heads have a shrouded intake port that reall restricts flow.  If you can find an earlier oval port head from a B210 that's worth 10hp. The large over port GX heads are out there but expensive, just paid $650 for one and spent 25 hours prepping it (granted for a street car I wouldn't spend that much time porting it).

 

You should be able to get around 80hp at the wheels with a mild bit of tuning; Weber DGEV carb, mild camshaft and cleaning up the ports.

 

I'm pretty sure I've got an extra set of A15 motor mounts, I've got a race in a week and a half but after that I can probably dig them out.

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Hi Tom1200,  My Riley is a 1951 RMB that originally came with the 2.5 liter engine. I am keeping the car as original as possible just swapping the horsepower to an engine I can get parts for on the road and that fits the engine compartment without modification of the firewall. The A15 engine is a perfect fit. The engine I am using came from a B210  SCCA ITC racer.  It was built as his spare engine 10 years ago. He sold the car but forgot he had the spare and I got it for the cost of the trip to get it.  If you have the mounts, let me know what you may want for them please.  Having them would help fab the new mounts for the Riley.

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You can have the engine mounts for the cost to ship them. 

 

The carb will definitely be a Weber 32/36 DGV. In ITC trim I think the A15 was around 90hp (at the crank. Riley 2.5s were around 100 correct? ITC rules didn't allow for porting of the heads but obviously you can do that in your car.  I clean up the ports using nothing more than a Dremel, the valve seats protrude into the port quite a bit, by smoothing the port bowl/throat it opens up that area by 2-3mm. Doing that is worth several horsepower. Additionally fitting a very mild cam along with a header will get you several more. You should be able to get the car back to it's standard horsepower. Couple that with the fact that I'm sure the Datsun motor & transmission are very likely 150-200lbs lighter than the Riley drivetrain, so  you're car should move out smartly.

 

I do have some motor bits I'm looking to get rid of very cheaply that might add some power.

 

On the subject of transmissions did you get a 5 speed per chance? The overdrive would be a nice feature. The A15 will rev 5000 rpm all day long but you might find that rather tiresome.

 

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Tom1200 I will gladly pay shipping just let me know how much and I will send a check to cover.  The original Riley 2.5 generated around 80 HP so the A15 is in the same range without mods and you are right about the weight savings.  I have  a 5 speed tranny behind it so I am covered there, although we raced with a 4 speed.  The major change will be in the braking system. The Riley has drums but only hydraulic fronts, the rears are mechanical.  I will have to modify the rears to hydraulics and put a proportioning valve in the system.  I am debating whether to put in a power assisted master cylinder but have little room for a large vacuum unit under the floor boards.  I need to do more research when the time comes for the mods to the brakes.

 

What other bits do you have?

Steve

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Depending on whether you have a round or oval port head I may have some gaskets. I've got a used set of GX double valve springs (good for 8000 RPMs but limit valve lift to around .4") which would work with a mild cam. I'll have to look and see what other goodies are in the cabinet I may have some valves that would offer a bit more flow.

 

If you are going to build up the A15 I'd go with the Weber 32/36 carbs, clean up the ports, but a set of SI valves (the stems are narrowed for more flow), use a Delta 278 cam (.420 lift 278 duration) and Isky valve springs. That would net you an honest 100hp at the crank maybe a touch more. Delta will regrind the crank for $75-100, the springs are around $125-150, new lifters can be had from Rockauto, the valves are around $100-150 for the set.

 

As for the rear brakes; as the RMB uses leaf springs perhaps you could use a Datsun back axle as I'd guess the track widths are pretty close? grant the wheel lug patterns are likely different so you'd need to have the axles redrilled…….might be simpler to mod the Riley brakes. If you use a a 510 wagon axle (H190) with aluminum center section in conjunction with the allow Z car drums the whole assembly is around 96lbs. That might also take off some more weight and help with the power brake dilemma.

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The A15 is already built and I have no idea what it was built with or any internal mods.  I plan to use it as is.  I have just finished scrapping a 720 king cab and have all the drive train.  I am already planning on using the short drive shaft to match from the A15 to the Riley main shaft.  I will measure the wheel width on the 720 and see how close it is to the Riley ( good idea!).  If that will work that's half the problem.

 

I do wonder if  anyone on the forum has put 16" wheels on a 720.

 

 A friend here suggested that since the Riley was known to stop with the brakes it had I may not have to have more than a master cylinder.  That would eliminate the booster and the space problem.  Until I have the engine in place all is conjecture at this point!  If you have the time give me a call after 5 eastern at 276 694 2499. Steve

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I will try and give you a shout on Sunday; like I said I've been prepping for a race weekend so I haven't had a chance yet.

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Tom, I tried to message you but got a message that you can't be messaged.  So here is my address.  

Steve Ferring

687 Knocking Shop Lane

Claudville, VA  24076

 

I will send pictures of the Riley to your email if you post it.

 

Thanks Steve

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The aheader I get the behinder I am.  I have been going thru the trailer trash that was put in a corner of the shop and forgotten.  I have found 210 drive shafts,  a rear end and a bunch of carbs that I think came off the 240 Z.  I am not progressing as much as I would like because I have been plagued by equipment breakdowns in the shop.  Hopefully that is over and I can resume the fabrication of the motor and tranny mounts.

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