15 replies to this topic

[Albino_Hedgehog]

Hello guys,

Just getting to the crunch time on my engine rebuild.

Its about to be sat on the gearbox and then dropped into the car!


However I was wondering what sort of figures I should be expecting from this build!!

Once it has been run in I will be heading to the Rolling road to have it checked! But obviously I will need to have an idea if what is disappointing or exceedingly good!!

So here's the specs:

1098 Block, Crank (Reground) & Pistons
295 Head, .60 thou skim, unleaded seats
MG Metro NA Camshaft

Maniflow alloy inlet
Maniflow Cooper Free flow exhaust manifold
Maniflow center exit exhaust

Hif38 or Reece-Fish 1"1/2 Carb

What figures would be Good? Bad? Disaster?

[Stevie W]

Hi,

 

The MG1100 (AD016) in standard form managed 55bhp and 61lbf/ft of torque running on twin 11/4" SU carbs from memory, so I'd expect something similar from your spec once correctly set-up!

 

The 1098cc A series doesnt like sustained excessive engine speeds but the long stroke crankshaft in these engines makes for a nice torquey engine capable of good performance!  

 

Cheers, Steve. 

Edited by Stevie W, 20 August 2017 - 06:42 PM.

[ACDodd]

Had a hand in a similar engine many years ago, it pushed 73bhp and 80lbft of torque using a fully flowed 202 head using 295 valve sizes. It used offset rocker bushes and a single hif44 Su.

Ac

Edited by ACDodd, 20 August 2017 - 07:04 PM.

[timmy850]

Whats the compression ratio like?

[whistler]

A friend of mine has a 1098 auto in his mini and he saw about 70 bhp on a RR.

[ACDodd]

8.9:1

Ac

[DomCr250]

100% spot on with the 70Hp numbers .. I had a 1098 on a 1st rebore, 12G295 and a midrange Kent profile (266 I think?) ..head was just cleaned up a bit and lead free exhaust seat inserts.  It made 72Hp on Red Lines rolling road over in Iver ..ran a 1.5" SU, a cheap LCB, standard steel inlet with the exhaust part hacked off.

 

I loved it, pulled well and still made decent revs too.

[Albino_Hedgehog]

Ahh brilliant!!

I was hoping for about 70bhp, so from your comments thats looking about right!

[dyshipfakta]

Sounds a cracking engine. To be fair v jealous

[ACDodd]

1098 based engines make great road units. All torque for a little engine.

Keep the revs below 5.5k and it last too.

Ac

[Albino_Hedgehog]

1098 based engines make great road units. All torque for a little engine.

Keep the revs below 5.5k and it last too.

Ac

Thanks I look forward to having it on the road finally!



I am also curious to know what they would be like on the drag strip, with Santa Pod having just passed....

I would imagine the high torque figures would be good, but the inability to rev freely would be a problem...

[Cooperman]

I built a 1098 engine for a historic rally Austin-Healey Sprite Mk.1. It was a 1098 engine bored to +0.060". Head was a well-flowed 295 with a CR of 10.2:1.

Cam was a Kent 266 with 1.5:1 roller tip rockers, 

Carbs were twin H4's on an opened out manifold, flywheel was a lightweight steel one and it had an Aldon distributor customised for this engine.

With a nice exhaust manifold and a quiet exhaust it gave 72 bhp at 5800 rpm. With a CR gearbox and a 'Post-Office van' final drive ratio its acceleration was stunning. remember, that car is around 100 kg lighter than a Mk.1 Mini-Cooper in rally trim.

[ACDodd]

The engine I mentioned above was in a pickup with 10 in wheels and a 3.44:1 fd. It did a couple of 17.4sec passes at the pod.

Ac

[minipickup]

I have an old 1100 block that had been pocketed that I took out of my Pickup as it was a bit smokey. Maybe I should rebuilt it and swap out the 998 that is currently in there!

[CityEPete]

I've got a 1098 on my 1950's Morris minor, it pulls really well even with four people on board, great engines imo.