18rg Seems slow

[ganador]

hey guys, i have a 18RG that ive rebuilt. The head is fully rebuilt its got new rings honed bores and rod bearings, and extractors. Its fully tuned but still seems quite similar to my 18RC in my hilux 4x4. Im wondering if this could be because ive got a pair of solexs that apparently come off an Alfa

[Rinmax]

What type of Alfa was it. If it was an 1800cc or a 1600cc have you changed the jets in the carbs?

[ganador]

What type of Alfa was it. If it was an 1800cc or a 1600cc have you changed the jets in the carbs?

it was one of them, umm i did jet drill one of the jets not too sure which jet it was though someone here told me to do it a while ago.

[jezza323]

sounds like u need to get it tuned properly to me

[ganador]

the carbies are in sync, new plugs, timings right, A/F is right. just curious what compression is the 253 head run. Its an 18RGR block and 253 head.

[river]

Hi,

I think the 253 head has an 8.4 or 8.7 compression ratio.

In stock form it was one of the less powerful 18R-G engines, but it should still have a good 30+hp over a stock 18R-C.

seeyuzz
river

[ganador]

Hi,

I think the 253 head has an 8.4 or 8.7 compression ratio.

In stock form it was one of the less powerful 18R-G engines, but it should still have a good 30+hp over a stock 18R-C.

seeyuzz
river

oh ok, i thought there was a low comp. head just wasnt sure which one it was. there is a little bit more power but not really a big change. i spose with the 4x4 being much heavier then the celica aswell.
On a compression test i got pretty much 145psi through the 4 pistons would that be normal with that head.

[ganador]

just discovered that the throttles only opening 3/4 with my foot flat, trying work something out to have it fully open. I think i need proper throttle linkage, ive got a bodge one made up.

[ganador]

Just fixed the throttle and took it for a spin. Far out it goes heeps better, you really need full throttle hey.

[Rinmax]

It does tend to help a little. Congrates on the fix

[ganador]

It does tend to help a little. Congrates on the fix

yeah , thanks. I wonder wat the higher compression heads would be like if ive got the lower compression head and it goes like that.

[mike1980ra40]

yeah , thanks. I wonder wat the higher compression heads would be like
if ive got the lower compression head and it goes like that.

you'd be snortin thru the traffic,
( just got mine all sorted I had similar lack of power, not any more ... )

[ganador]

Yeah i just had to bend the Hilux pedal back a lot bit. Now i get WOT, woot-woot. I just need to sort out my jetting sizes to get them all to the 18RG specs seeing as they come off the alfa.

[mike1980ra40]

My main jets are 135 and seems to go all right on those. try a set of 145's if you want
a bit more woot woot

[ganador]

Here a pic of both jets, i understand that these jets dont look the same as the ones from the 18RG. Ive put the sizes or numbers that show on the jet its self. The little one i had drilled by my mechanic.

Edit: Where it says 192 it should be 190