holden six power?

[army2a]

hey guys, im looking to change my 2.25 petrol for a 186 and wondered if im really going to gain that much more power? ive got 35 inch tyres on the vehicle so the gearing has gone up so the 186 revs shouldnt be an issue. i have a 7.1 head on the 2.25. has anyone decked these heads and was it worth doing? i would rather keep the the 2.25 but i need to be able to do 80kmh at least. any help would be appreciated

[wrinklearthur]

Hi army2a

Try a search on this, as I seem to recall a thread on this subject.

Port and polish, cam, a bit of compression, better dizzy, carbie, balance and so on .

Could be fun to do the 2.25 up.
.

[Blknight.aus]

80 is the optimal cruise speed for a series you wont hold it on the hills but if you cant hit it normally then your engine is sick and needs some love.

getting the heads done to up the comp a little is a good idea and will be cheaper than trying to install the holden donk.

[Col.Coleman]

Have a flick through here before pulling it out

Land Rover Performance Tuning - Power Plus - Land Rover cylinder heads, camshafts, SU Carb system, 2.8 engines - ACR - Automotive Component Remanufacturing Ltd (http://www.automotivecomp.com/landrover_perf.html)

CC

[wagoo]

Hi army2a

Try a search on this, as I seem to recall a thread on this subject.

Port and polish, cam, a bit of compression, better dizzy, carbie, balance and so on .

Could be fun to do the 2.25 up.
.
A mate of mine did that, minus cam and carb,but with tuned length extractors on his 2 1/4 series 2 swb about 30 years ago and it would blow the doors off my 186 holden engined 80 inch Series one.
bill.

[isuzurover]

The 2.25 can be made to go fairly well, however unless you switch to gas or PULP you will have problems with pinging/detonation offroad.

[wrinklearthur]

Now for something really weird, how about doing nothing except adding a bottle of NO2 and a little plumbing !!!

[wrinklearthur]

The 2.25 can be made to go fairly well, however unless you switch to gas or PULP you will have problems with pinging/detonation offroad.

Its a big wheel that doesn't turn once!

Read this thread by Blknight.aus

http://www.aulro.com/afvb/technical-chatter/142355-turbo-2-25d.html

.

[isuzurover]

Its a big wheel that doesn't turn once!

Read this thread by Blknight.aus

http://www.aulro.com/afvb/technical-chatter/142355-turbo-2-25d.html

.

Not sure what you are trying to say/suggest?

However I recommend that army2a doesn't follow Dave's idle speculations in that thread as he will likely end up with something that is (almost?) impossible to start and has less power than a stock 2.25P. If you were suggesting a diesel swap, then bolting in a 200 or 300 tdi would make much more sense.

Back on the worked 2.25P, one useful mod that was prompted by your link Arthur, would be fitting a 2.25D flywheel to a 2.25P. The 2.25D flywheel is a LOT heavier, so would be useful for ensuring the engine retains/increases low down torque after the mods. Fitting a (stronger) 2.25D crakshaft would be a good idea as well. I gave one to Col Coleman recently, which he may part with if you ask nicely.

[wrinklearthur]

Not sure what you are trying to say/suggest? .

Hi All

Touching on the pre ignition subject would take this thread back into what Dave started in the his thread, using of a turbo to up the horsepower of petrol or diesel.

If the head planning isn't done to extreme and the distributor timing curve is reset to match the fresh characteristics, some pinking on a hard pull could be tolerated.

Fitting a heavier flywheel would definitely help smooth out the low to midrange rev pulling, but I think that, in the situation of cut and thrust driving in say, peak hour traffic, it would most likely be detrimental to the fuel economy.

The best bang you can get for your buck, would be the fitting of a well made set of extractors.
.

[JDNSW]

For that matter, it is very likely that if you are dissatisfied with the performance of your 2.25P, that bringing it back to original condition would be a very marked improvement!

John

[101RRS]

I have had both 161 holden engined landies and 2.25 engined landies. When the landie engine is in good nick (I had just rebuilt mine) it is a good match for the holden. The landie revs a bit better and feels a bit more sporty but the holden within its rev range does have a tad more power but feels a little stifled compared to the landie.

Fuel consumption worked out about the same - 17mpg in the old money and cruising speed was similar at around 105kph indicated - often saw 115 downhill but the death wobbles form the front ends became an issue at that speed. Most say a series landie cruises around 85 but that was not my experience and my cars were my everyday drivers covering a couple of trips a week on over 400km in one go. Mine cruised faster than most would say so now but we did not have gps then so the speedo may have been optimistic but I do not think so.

So - I would stay with the landie engine - get the head shaved a little, get the carby reconditioned and tuned up, same with the dissy and put a set of extractors on it.

Garry

[isuzurover]

I have had both 161 holden engined landies and 2.25 engined landies. When the landie engine is in good nick (I had just rebuilt mine) it is a good match for the holden. The landie revs a bit better and feels a bit more sporty but the holden within its rev range does have a tad more power but feels a little stifled compared to the landie.

Fuel consumption worked out about the same - 17mpg in the old money and cruising speed was similar at around 105kph indicated - often saw 115 downhill but the death wobbles form the front ends became an issue at that speed. Most say a series landie cruises around 85 but that was not my experience and my cars were my everyday drivers covering a couple of trips a week on over 400km in one go. Mine cruised faster than most would say so now but we did not have gps then so the speedo may have been optimistic but I do not think so.

So - I would stay with the landie engine - get the head shaved a little, get the carby reconditioned and tuned up, same with the dissy and put a set of extractors on it.

Garry

In a similar vein, back when my 109" was 2.25 powered, I fitted a heavily milled 8:1 head (so 8.5-9:1 compression overall), extractors and a new zenith carb. It would easily wind the speedo past 75 mph if I wanted to (no OD).

However we are perhaps forgetting that the OP is running 35's with standard gearing(?). So some serious extra grunt is needed to compensate. Another option would be to fit 5.29:1 Toyota hi-ace centres, which can be fitted in conjunction with upgraded axles (and lockers if desired).

[101RRS]

owever we are perhaps forgetting that the OP is running 35's with standard gearing(?).

True but it aint going to happen with a stock holden either.

Garry

[army2a]

Thanks guys for all your input, much appreciated. I've got extractors and a new exhaust on my 2.25 and it goes ok with the 35s, but it just needs a little bit more power to drive in 4th. The motor runs great, but I'm about to replace all ignition gear (points, plugs , leads etc) and do a compression test on the motor and see where it's at.

[Jeff]

True but it aint going to happen with a stock holden either.

Garry

I disagree. I had a 202 powered 2A hardtop many years ago that went extremely well with 35" ATs. It was overgeared with 31s or 7.50s, but great with 35s. It was a very healthy, but standard 202. The 186 I had in my wagon later would struggle with anything, probably even 6.00s.

Jeff

:rocket:

[Lotz-A-Landies]

True but it aint going to happen with a stock holden either.

GarryWhich stock Holden are you talking about?

A 161 off an automatic gearbox maybe, but a stock 202 off a manual gearbox would perform well, or a stock holden 202 off a 1 Tonner even better.

Then we can talk about stock XU1 Torana engines.

It all has to do with the capacity, cam and carburettors. And many stock Holden configurations were good in Land Rovers, but clapped out Holden donks were no better than clapped out Rover donks.

[geodon]

Are they good, special or to be avoided?

I've been told I have one (173) & the eng. no. seems to back it up: HD30742.

I hope they are not too "edgy" or rev hungry!

Condition unknown ATM but I will soon mount it in the rolling chassis & fire it up. I will be using 186 manifolds & a simple Stromberg carb.