donut
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| posted on 22/5/06 at 06:59 AM |
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Rebuild or just pop on Throttle boddies?
Someone told me this weekend that just fitting throttle bodies to a 2 litre Pinto would give me 150bhp.
I was going to buy an old 205 block pinto and rebuild it and fit twin 40's etc and build the engine to about 150bhp which is the sort of power i
want.
The engine i have in my car is a re-built but std 1978 pinto built by Mac1.
SO what do i do
1, Re-build an engine to 150bhp or
2, just plop on some throttleboddies on my existing engine for the same power?
The budget i'm kinda guessing would be the same for both or would it still be reasonably cheap to go the whole hog and rebuild an engine &
add throttle bodies to?
I want it to be a pinto so no suggestions on alternative engines please 
Your thoughts.............
[Edited on 22/5/06 by donut]
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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flak monkey
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| posted on 22/5/06 at 07:02 AM |
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I doubt *just* fitting throttle bodies on their own will give you 150bhp without some headwork and a decent cam. Bottom end shouldn't need
touching for 150bhp asumming its in good condition and you dont want it balanced... (but as its an older, ie not 205 block, I would limit revs to
about 6300ish)
David
[Edited on 22/5/06 by flak monkey]
Sera
http://www.motosera.com
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britishtrident
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| posted on 22/5/06 at 07:08 AM |
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Zetec+megasquirt -- much cheaper in the end
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NS Dev
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| posted on 22/5/06 at 07:34 AM |
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just "popping on throttle bodies" will not substitute for having an engine capable of breathing through them!!!!
Std tuning procedure still applies, and throttle bodies will not give you any more power than twin webers or any other induction system capable of
flowing what the engine can!
I think your advisor was applying results from well designed 16v engines to the pinto. Many good 16v engines will make good power with simple bolt on
inlet mods because it's the inlet system that holds the engine back.
This is not the case with the pinto, in fact the std inlet manifold and a 38 dgas carb are good for 140hp. Modify the engine AND fit the throttle
bodies, or modify it and keep the std inlet.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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zetec
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| posted on 22/5/06 at 08:12 AM |
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Fit the TBs and see how you get on. You can always transfer them to the new engine when you decide to change .
I would say that if you are going this route that the cost of the ECU/TBs etc over the carb makes the Pinto a bit overpriced. I think the Pinto is a
good option if you dont need to rebuild it and you are happy with it as standard, but thats me.
The advantages of the TBs is that they can give better fuel control than any carb and hence the "real world" power and torque may be
better even if the power at 6500rpm is the same.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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Jumpy Guy
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| posted on 22/5/06 at 08:18 AM |
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slight thread highjack- i have a 205 block pinto sitting in the corner of the shed
anyone guesstimate how much ££ i would need to have it rebuilt, add throttle bodeis etc ??
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donut
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| posted on 22/5/06 at 09:23 AM |
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To be honest i would rather stay away from all this electronix stuff and keep things as simple as possible.
There is the option of fitting bike carbs i guess?
The main thing at the moment is do i buy a 205 engine and do that or pop a new head, cam and carbs on what i already have & do it as a short
winter project?
[Edited on 22/5/06 by donut]
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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DarrenW
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| posted on 22/5/06 at 10:29 AM |
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To give you some ideas on budget options following my own research;
1. I ported my own head (£0), fitted kent FR32 off ebay (£35) and had head skimmed 40thou, guides redone, valve seats cut (£80 cash). With 38 DGAS
(£120) and exhaust system (£475) id like to think ill get 130 ish bhp, i reckon im over optimistic though seeing as i dont have a flow bench.
2. Bike carbs (£0 from Guinness), manifold (£ awaited from Deneo), filter (£approx 80), cables, pump etc approx £50. Id like to think ill get 140 to
145 bhp. (Mates similar spec lump with twin 45's is getting approx 140bhp)
3. Megajolt - ECU (£100 off Zil), coilpack, leads, trigger wheel etc etc approx £50. Power - god knows, engine will probs just be better behaved and
more tunable.
After this i contacted Mookys engine builder. He can port a head to stage 2 for about £200 + vat and recommends FR33 kit (these can be a handful on
road car in wet).
For bottom end he quoted full refresh inc pistons, re grinds, full balance inc lightened flywheel is approx £500 + vat for self build up. This also
includes matching block to head to optimise CR. I get the impression if you took the bits to him he could do the balancing and lightening work for
between 200 and 250 ish + vat.
If i was you id leave bottom end alone. Get head done well with nice cam. Bike carbs and good ignition should see 145 at the flywheel just. maybe with
FI you could break 150.
I dont want to be optimistic on the BHP. Its all a bit academic and RR claims are well discussed already. At the end of the day increasing from a
wheezy std 100 / 120 ish bhp to 150 is already a huge 30ish%.
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DarrenW
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| posted on 22/5/06 at 10:36 AM |
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To summarise, im in exactly same position as you. Decided to enjoy the car and fit carbs and better ignition as short summer / autumn project. They
are all saleable commodities should the need to spend more later be unbearable.
Im only fitting bike carbs and megajolt cos i fancy doing it and like a challenge. No better reason than that im afraid.
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donut
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| posted on 22/5/06 at 11:02 AM |
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quote:
best go to bed and pull the covers over your head and never get up again really
Oooh that sounds like a plan!! 
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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donut
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| posted on 22/5/06 at 11:05 AM |
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Cheers Darren thats really interesting. My engine is the meesly 105bhp jobby so 150bhp will be nearly 50% more!!
Lots to think about!
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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